<human>: A friend of mine (let's call her Kerry) has been saying here and there, always half-jokingly, that she isn't smart enough for her major. I've seen her succeed in her classes and I think she's more than smart enough to keep going, so I'm not sure what to do. I want to encourage her to keep trying, but I don't want her to feel like I don't understand her (and maybe I don't) or that I'm ignoring her feelings and just telling her to do what I would. At the same time, I don't even know if I should encourage her to stay; I could just be feeling that way because I used to have a similar mindset and I don't like when people sell themselves short like that. I'm also not even sure if sticking with her major would be the best thing for her, and I guess I just don't know what would. Writing this out, I suppose I really just want to support her and help her figure things out. Any advice would be greatly appreciated.

Could you distill the essence of the text into 1-3 sentences?
<bot>: My friend is selling herself short, saying she isn't smart enough for her major. I disagree, but I'm not sure what's best for her or how to support her.