What if Bianca were Italian instead of Hungarian?
Since, "Bianca" IS an Italian name (meaning "white"), it would make the most sense for her to be this nationality at the Rescue Aid Society instead of Hungarian (which was no doubt chosen as her actual nationality to coincide with her voice actor, Eva Gabor's birthplace). Still I had asked this question to my mom and she said, that if Bianca were an Italian mouse, she'd likely tell Bernard, "I would neva dream of tipping over the shalt-a shaka, darling!"*
* We also took Bernard's superstitions beyond merely triskaidekaphobia (spilled salt, black CATS, etc.)