Do you think I am in the wrong?

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So, if you read my other post then you know that my husband and I have had trouble with my 15 year old step daughter. Long story short, she threaten to kill herself because we took her phone and she just wanted to the attention. Well they sent her to a mental hospital for 10 days and she came home yesterday. And honestly, she's taking things to far! She tells us that if it wasn't for MY daughter, who is 2 months old, that she would have killed herself. That pissed me off, don't use my daughter as an excuse to your stupidity. She didn't kill herself, because all she wanted was the attention! She has never paid that much attention to the baby, and now everything is about her. I think she's jealous and instead of showing it, this is her way of hiding it. Which makes me 10x more worried about my daughter. Because I know how my step daughter is and when she gets mad she doesn't think before doing. I've been scared since she's moved back with us. Anyways, back to the story. So she's not allowed to cut her food up or hold sharp objects, or even have an ink pen or we need to check her?!? She was never suicidal before we took her phone and she wanted attention! She's taking this too far and it's pissing me off. I'm not putting up with this crap. We told her she can smoke just do it outside. (I know it's bad parenting but don't bash, it was for the safety of the baby) Because if we don't let her smoke, she will just smoke in the house! Well, I wake up this morning to get my nephew ready for school and my living room smells like smoke. So she got up and I said something. She said that she smoked in the garage, which is bulls**t because my husband and I smoke in the garage when it's really cold outside and our house NEVER smells like smoke. Well, she got a shower last night and went to get in it today and I told her that she either takes one at night or morning because she's not taking 2 showers a day. She has this journal thing she writes in and she asked for a pen. (probably to write about me telling her she's not taking 2 showers a day) and then she says Oh and when I come out with the pen you have to check me. I'm not doing this bulls**t! It's for attention and I'm not doing it! It's pathetic! And like I told her this morning, you never hurt yourself with a pen before why would you do it now? She's like it's just precaution, and I told her well your dad can do that because I'm not worried about it. I mean come on! I know a few people who went to mental hospitals and when they came out they never followed what the dr. said they should do. Most teens won't! This is just going to far and It's pissing me off! All for attention. I focus on my baby and nephew. I don't have time to play her attention getting games and I don't feel sorry for her because all of this is stupid. I needed to vent. What's your opinion on this? Do you think I'm in the wrong for saying what I did? It's just all for attention and she can make everyone else feel sorry for her, but I'm not. Thanks!