I think it's a good thing you're doing. We did the same with my niece, even though it was hard. Her "dad" had supervised visits for a while...he eventually didn't even come and they were cancelled. He will yell and pitch a fit about how we are keeping her from him, but he only wants to see her when it's convenient for him. Fortunately, she's figured out he's no good and won't even talk to him any more.
I honestly NEVER thought it would work out...worried about being able to keep Brit for years. We couldn't even grieve for the death of her mom, because we were so scared Brit would be taken away.
It did work out, and I'm sure it will work out for you.
BTW...make sure she doesn't bite off your hands...you need them to type and keep us updated
Hugs and prayers!
Amy