I don't mean just the times when she bit the gloves to pull them off her hands, which may be done easier than with her prosthetic hands, but also these two moments:
After she received a puppy doll from Hodgins, she held it with her mouth. When asked why she chose the puppy doll, she replied she was called "Gilbert's dog" by Gilbert's brother, which may be interpreted as an apt nickname for her biting-like-a-dog behavior.
After Gilbert's brooch was bought back from the black market by Hodgins and returned to Violet, she again held it with her mouth while lying on her bed at night.
I found a discussion on Reddit, in which one redditor said
From what I understand it's because Violet's hand can't grip hard enough to put the glove on properly so she used her teeth instead.
I don't completely agree. After all, Violet performed a rear wrist lock on a customer, so she can grip hard enough.
Another viewpoint is that Violet did it because
she lacks feeling in her hands, but she still has feeling in her mouth.
This seem more plausible, but I still think she could feel more by touching with her cheek, which she did initially with the puppy doll.
Is there a better explanation to this curious behavior of Violet-chan?