Whoa, you need to be very careful here as all it takes is one bounce on your babies back and she will be dead. I am not an advocate of bringing these little dudes to dog parks or even letting strange dogs walk up to my little ones. In a larger dogs mind they might view her as a rodent and with one bite try to kill her.
I also think dog parks carry a lot of disease but each person has to make their own decision of this.