Wanting a second little lady - Who's got two girls?

[WafflesMom]

My 2 y/o Waffle is a sweet and gentle girl. She is spayed. We live in a small community and she loves all the dogs and plays well with them. She is more submissive and not at all jealous or territorial. I feel like it's a good time to get her a playmate but would rather an adult female around her age and size instead of a puppy.
Has anyone successfully socialized two young adult frenchie females? I am looking at one who is not yet spayed. Would that be a problem?
Thanks in advance!