Since dogs are den animals, you probably have a crate too big. Because if the crate is big enough then she'll "do her buisness" in 1 spot and sleep in another. So you might want to get a little smaller one.
I know for crying out loud! There called either Short-haired or Long-haired Chihuahuas! I agree that people should stop calling the that. Did you know that 90% of T-Cu...
Well whenever you see her be mean to your Springer you should punish her or keep her on a leash when she's with your Springern and when she nips or something you pull her back and say Ah-ah really fast. Like a punishment would be take her in her kenn...