I've watched all of Suits. She seems very similar to her character, Rachel.
I'm sure I read somewhere that amongst the cast she was the one they all agreed was most like her character.
I think it's classic soap acting, they don't play someone too different to themselves so they seem more believable.
True, but she does a decent job nevertheless. What we don't know, because there is no evidence, is whether she can play anyone other than herself. She might be phenomenally talented and versatile, but it's surprising this hasn't been spotted before, especially for someone so driven.