No, she can not legally move out without having any recourse until she is 18 years old. Regardless of whether or not the law "may" or "may not" do anything, if she does, this is a terrible idea. She is 17 and not legally an adult until she turns 18. Period.
***Answering legal questions is a complex matter and cannot be done without further research. My answer here is based solely on the information given in the question and should be taken as informational only. This is not legal advice. My answer here does not indicate that I represent you now, or that I will represent you at a later time. I take clients on a case-by-case basis, and only after initial consultations. ***