Have you taken her to the vet? In a lot of natural bob/screw tailed dogs, the gene that makes them have a short tail can also affect other structures in that area. On the other hand, it could just be a bit of weakness in the perineal area simply because she's a baby.
As far as training goes, basic house training 101 is take her out after she wakes up, after she eats, after she takes a long slurp of water, after she's been play for a while, and every twenty minutes or so just because. If you can't be right on top of her, watching her like a hawk, then she needs to be crated or otherwise confined.
For socialization, think of it more like sightseeing. She needs to see the world from a safe place, not meet and interact with every person and dog she sees. Sitting in the car at a shopping center or the like, watching the world go by, and getting rewarded for being quiet is a good option.
As far as manners and obedience, I recommend checking out the Kikipup videos on YouTube.
Dog Training by Kikopup Also, teaching her to accept handling and grooming procedures is a good idea. Deb Jones' Cooperative care videos are a good resource.
Cooperative Care with Deb Jones
If you are interested in a paid resource, then there is a really good online puppy class that is available as self study from the Fenzi Dog Sports Academy.
Fenzi Dog Sports Academy - FE115: Baby Genius
