She is a lovely little puppy. It sounds like she has a good temperament for a service dog. Not being overly invested in playing with other dogs is good when working. Of course you want her to get along with your dog, and she will likely take her as a member of the family, or part of the "herd". You may already be doing this, but for me the most helpful thing for crate training was all meals are fed in the crate. When my dog was young, at mealtime he would run into his crate so fast, he couldn't stop and would crash into the back wall. Stuffed kongs, or bones in the ex-pen help make it a good place too.
