Scrapper

Scrapper: skrap-er
noun Informal. An aggressive fighter who is small in size. Implies a willingness to stand her ground, not be taken advantage of, and fight dirty when necessary.

Person 1: did you hear? Rebecca punched her boyfriend in the face when she found out he was flirting with Jane.

Person 2: Rebecca doesn’t put up with that crap from her man- she’s such a scrapper.