Please help... my sister is struggling?

she's struggling alot. she's in a very hypersensitive mode. things are bothering her that really shouldn't, and she knows that, but she feels like she can't control it. she's diagnosed with asperger's. she also has pure o, which causes her anxiety pretty much all day. she's anxious about many things. she says that mainly she fears someone getting mad at her and taking something very important to her out of her life. she won't say what that is. she feels like it's a bad idea to say. she's complaining about pain in her stomach, and breaks down crying every now and then. she says she can feel her heart beating and just wants to scream. she also feels like she has to keep tabs on the way she behaves. she says she obsesses alot over trying to be perfect in who she wants to be, and feels like if she lets go of that, she'll become some person she fears being. last, she's losing alot of sleep. she's often up really late at night on her worse days. once, she couldn't fall asleep until 6am. she feels like she's a prisoner to her mind. she's improved with getting to sleep earlier, but she really wants to change. she's been going through this much more extremely for the past 2 years, and she says she can't really even remember what it feels like to have a clear mind and be in a peaceful state. how can she improve this condition? i noticed that she tells me she trys to stop, but that itself just gives her more anxiety, and that she's studied so much of her anxiety patterns and trying to find ways to maneuver around it. when she can't do it, she gets frustrated.