I think some of the tail issues may just be our babies personality showing thru.
When Sassy gets excited, boy she stands at attention and looks like the PERFECT image of a little Maltese. But sometimes if she is doing what we call her "Ditty Bop" she just kinda bops around with her tail curled but not completely touching her back, and sometimes if she thinks she isn't going for a car ride and she knows the mommy is her tail may drag and train behind her on the floor. And too, she sometimes does what I call her hunting dog impression. You know the one, where she stretches her neck out and looks almost level from nose to tail. Like she is sniffing the ground for scents. I thought once that her back was not level because of the way she "bops" around. But I took her to a local judge who judges toy breeds in the big name dog shows. I told him that I do not show her but I just wanted an honest opinion. He checked her over good and said she is a great example of the Maltese, straight topline, good tail set, he checked everything. In fact, he talked me into showing her, which I only did one time because Sassy absolutely HATED :new_Eyecrazy: the ring. She actually won that day, she took a Best in Breed and a 1st Place.
But then we brought the ribbons home and said, well that was not much fun. So that was the end of Sassy's show career. Although I bought her from a show breeder as a show puppy....I actually bought her as a pet and never intended on showing her. Anyhoooooooo, maybe your baby is like Sassy and just get lazy with her tail from time to time.