Another pup would be awesome! I'd also look for other YT members in your area, or other small dog play groups in general. Just make sure you take the play time slowly. I work at a doggie day camp and I see tons of people who just assume that since their dog likes one or two other dogs, they can plop them into a camp with 15 other dogs. Not saying you are!! But if your girl is a tad skittish around new faces, maybe start with one or two new friends first.
Good luck!