Oh Saab, I can only wonder if it was reverse and it was the mother who ended up in prison for years and after being released the first thing on her mind was to reconnect to her child if you would be telling the father that his new female partner is in fact the mother and he should do whatever is needed to block the woman from being in the little girl life.
Bet you would not be doing so not in any manner or in any way.
Sorry but the father rights and far far more important the child rights to have a relationship with both set of parents whenever possible far out weight the rights of the mother not to have her life place in some turmoil.
Not an implanted fear of her father or a fear with no foundation of kidnapping is enough to stop the rights of both the father and the child to get to know each other.
Hopefully, the mother in this case will take a deep breath and begin to work the situation out with the man in a peaceful manner for the good of her child.