It has been years since my time in the NICU. We lived 50miles from the hospital. I remember reading a book that emphazied giving yourself permission to be away from the NICU. You need to take care of yourself right now. There are nurses there to help with your sweet baby girl 24/7. You're going to be dealing with plenty of exhaustion once she gets home. Don't use up all your strength right now. Don't feel guilty leaving her, you need rest and recovery to be the best mom possible. Your daughter needs you healthy when she comes home.
One thing I did was record myself reading books for my twins. The recorder stayed with them and the nurses would play it for them at times when I couldn't physically be at the hospital.
Give yourself permission to be away. Your daughter has passionate care takers in the NICU. Taking care of you translates into taking care of your sweet princess!