My mom is being bullied at her work because she can't speak english very well?!?

it's starting to piss me off. she's smart and came here as an immigrant from korea... she's 43 and a nurse for senior home care, which is very diffulcult but she struggled her way up without knowing any english, now her co workers are bulling her for having a ******* accent... what can i do? i'm 14 thanks!