Teenage daughter anxiety

I am struggling with my thoughts in regards to my teenage daughter’s anxiety/depression. After discovering she was suicidal we sought treatment for her and after weeks of intensive outpatient therapy and antidepressants she has improved but I’m having trouble moving forward. She was never honest with me about her feelings/actions and I have trouble believing that she will tell me if she is struggling again. I realize that my anxiety over her anxiety isn’t helping anything but I can’t seem to move on from this. I find myself watching her like a hawk and wanting to monitor her phone. I don’t want to live like this- I’m making myself miserable. How do I move on?