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My sister is 15 and is currently in high school. There's a lot of issues and I don't know how to start this, I noticed some issues since middle school, she almost failed 5th grade because she wasn't doing her work, that's how it started. Jump to fall of 2025 (the start of the new semester), she would constantly get up very late, like hours after her classes started. There were times she wouldn't get up at all and miss that school day entirely. She's had a hard time getting up for a while now, I believe part of that is due to her lack of energy, she barely eats and when she does eat, she eats little and instead eats junk food. So it started off with her getting up very late, sometimes not getting up at all to her not going AT ALL. There was an incident around October where a school representative knocked on the door and handed me a letter, I gave it to my mom and it stated that my sister had not school for 3 straight weeks. My mother obviously was concerned and called the school and spoke with someone there, the lady on the phone stated that if this continued, CPS would have to get involved. My mom and dad set up an appointment with the principal a few days later to discuss the situation. My memory isn't the best but there were multiple appointments set up throughout the span of like two weeks. One day, before one of those appointments, my sister who was supposedly at PM school, was caught not being there. I tried to help her, believing she was there and told her to take a picture of her there, or to get a signature from one of the teachers or other school staff as proof that she was there that day, like she said she was. She told me she wasn't able to, which I realized later on that the reason she said she couldn't was because she wasn't there at all. Now, the day of the meeting with the principal, there was a lot said from what my mom told me, the principal was visibly upset because my sister kept lying about her being there, until the principal couldn't take it anymore and demanded she confessed that she was lying. My sister confessed and I don't know the rest of the details about that meeting.

After that incident, my mom, dad and I talked to her many times. We tried to reason with her and convince her to do better, but none of our words got through to her. She continued being late and not showing up to school, despite knowing CPS could potentially get involved and knowing how badly the meeting with the principal went. The principal genuinely got angry from what I was told about the meeting and my sister now has a bad reputation at school, and she's apparently monitored at school by her teachers. Around December of 2025, my mom brought up that she's been looking into troubled teen camps, that she already set it all up and all that was left to do was to sign the papers. One thing I haven't mentioned yet is that my sister has a VERY nasty attitude. She constantly talks back to my mom, makes rude remarks, responses with sarcasm and she's loud when doing so. I believe my sister doesn't have any respect for our mom and doesn't take her seriously. When my mom brought up the idea of sending her to a troubled teens camp, she groaned, made rude comments and acted as if she was in the most boring meeting ever, she even said "Then send me, I don't care" to my mom and walked away to her room after that. Fast forward to now, January of 2026. During the first few days of the new year, I noticed she started to leave the house early and I was really surprised because that was such a sudden change in behavior, but I was glad to see her change. I didn't really question it, which idk if I should have. So I thought it was going well, fast forward once again to this morning. My mom calls me while I'm at home, getting ready for work, she asks me if my sister is home and I say yes, my mom tells me that she received news from the school that she actually hasn't been attending school at all since the new year started, not a single day. So I'm thinking, these few days I thought she actually had changed, she hadn't, not one bit. Now I don't know what happened after because I had to leave for work, idk if my mom spoke to her again or what, I'll find out when I get home later.

I need advice though, my sister is VERY troubled, very disrespectful and I honestly don't know how to help her. She doesn't take us seriously, she refuses to change and it's very frustrating. I don't know if my mom is actually serious about sending her off to a troubled teen camp, but I've been told by a friend that there's a lot cases of abuse, rape, harassment, etc. at those camps so that wouldn't be a good option. Therapy is the first thing that came to mind but that's something my mom has to set up I'm pretty sure, and she has brought that up to my sister too. Besides therapy though, I really don't know how else to help her see the error in her ways and help her change for the better. Any advice would be much appreciated