My question involves criminal law for the state of: Massachusetts / Florida

A girl (18) in Florida wishes to leave home. Her parents have arranged for a round trip ticket to MA to visit. If she does not want to return home, I am prepared to allow her to move in with me.

Are any laws being broken? The round trip ticket is indeed to visit me (long distance relationship) but they have specifically said she is not allowed to stay with me.

Since she has reached the Age of Majority in both FL and MA, my understanding is that she has the right to choose where she stays and her parents do not have the right to force her to return home, or detain her at home. Is this accurate?

Basically I'm afraid they would be angry and come after me, and I would just like to make sure the law is on my side.

Thanks for any information.