The police likely wouldn't get involved - period. This is a civil matter, not criminal.
And please don't assume that nobody else has gone through a similar situation.
The basic truth is that you've gone four years without seeing your daughter - you're not going to be able to simply turn up and get her tomorrow.
Think of HER.
Not YOU.
HER.
By all means, hire that attorney and listen to what s/he says.
Good luck.

