I agree, she NEEDS an emergency spay ASAP especially not knowing much about her back ground. Here are a few things you NEED to look up, AAI, Chiari, Luxating Patellas. If you do not know her back ground these things can be passed on to any pups she may have & NOT worth the risk of loosing her only to bring pups into this world who may have any of these conditions.
Please do the responsible thing buy your girl & spay her ASAP.
And Welcome to YT !