It's more like "Tony, I respect you and the family, and I won't flip,never, but you must help me,"
and then Tony replies "sure Adriana, now I call the lawyer, you stay out of Jersey, until I, chris and the lawyer, don't resolve the situation "

and then has her killed anyway because he's not gonna take a chance that she might actually flip.

And I don't think she could leave Jersey. The FBI basically said, cooperate with us or you'll be arrested.

The point is, Adriana wanted out and she wanted to get out with Christopher, together. She's not going to accomplish that by siding with the mob, the one thing she was trying to run away from.