Lexie is a wonderful name and se looks like she's right at home with you. I too have a great affection for silvers and I think it's wonderful that you brought her into you home when you did. She is a real beauty!!!
Oh my bad, I read little girl as a 3 year old - anyway - hope it all works out for you and maybe the little girl could come over and help walk the dog or just socialize him/her. A win-win situation for both the dog and the little girl. Good luck and keep us posted.