Its really hard for shelter workers to give you an exact assessment of dogs because the way they act in a shelter environment could be exactly opposite when they get into a home environment. They can give you their best judgments, but some things are just completely unpredictable.

In dog groups, sometimes 3 can be a bad number, especially if all 3 are female and approximately the same age. There is a chance you guys could have worked through the struggles, but there is also a chance it would have never worked. You have to put your girls first and determine what you are willing and able to do. I think your mom made the judgement she was comfortable with and no one can blame her for that!

I'm sorry it didn't work, but I'm sure there's another pup out there in need just waiting for you!