I started off as an environmental sciences major, then changed to Math and later changed to French & History double majors. It can be a bit overwhelming to decide on a major but your friend is already on the right path by following her interests and being clear she doesn't want to continue with Math.
I coach people on their careers and what I tell them is to listen to the hints you get along your path. Most people don't have a "flash of lightening" moment about what they want to do with their lives or what they want to major in. It's more about paying attention to the breadcrumbs (hints) that you get along the way. So, instead of thinking about what she wants to major in and do with her life (those are such big questions they can create a lot of pressure), I'd suggest she starts by asking smaller questions- what was her favorite class? What does she like to do with her free time? Which homework does she choose to do first when she has several different assignments to do? If she was going to have lunch with one professor to learn more about their field, who would she choose?
Those questions will all give her hints about things she's interested in. Then, I'd encourage her to take more classes in the things that are interesting to her. When she finds something she likes enough to spend a couple years getting deep into it, that may be a good major for her. Meanwhile, she should also work with her college counselor to make sure she understands the required courses for whatever path she chooses.
Like others have said, a college major doesn't have to determine your future career - in a lot of fields you can study one thing and go into something different. I suggest your friend spend time in school learning about the things that interest her and make her want to learn more. Her major and future career will become clear if she continues to follow her interests.