>>19050377She sounds believable in the sense that she really sounds like a Mexican immigrant that has been in the US for 3 months tops. If that's what they're going for then yeah, it's really believable. But that would excuse her because English isn't her mother tongue and so on.
In truth, she doesn't sound believable even when she speaks in Spanish, that's how bad she is. She really needs a manager and it's not because of the language barrier, Asuka yelling in Japanese like a Yakuza side character is believable even if you don't understand wtf she's saying because she's good at yelling.