As you have learned, love does not come instantaneously. The new little girl sounds like she has picked "you" and if your kids and Autumn love her and she loves them, then I say it's a perfect match and you will end up loving her just as much as you do Autumn. You would not believe how many dogs have either an under bite or over bite. My Azrael has such a big gap on her overbite I call her Buggs. She has no problem eating at all and no one even knows she has one since it doesn't show. I know your new little girl is going to work out perfectly, and she needs a loving home with those who love and accept her as she is.