Well, I doubt it's in the Oxford English Dictionary but I'd class Rose and Donna as chavy.
Rose is Working Class.
Donna is lower Middle-Class.
Both of them have jobs, don't sponge benefits off the State, spend their days getting drunk or spitting out unplanned babies. So in what way are they "Chavy"? It can't be just because they're unafraid to speak up for themselves rather know knowing their place, is it?