What does it mean when you throw up a little everyday for two and a half months?

my best friend mel just told me that this has been going on. she eats and a little of everything she eats comes back up. she says she's completely fine otherwise and she is still gaining weight (perhaps a bit more than she should) and has voracious love of food still, but i think this is a problem. she refuses to see the doctor because she's poor and her family doesn't really support her anyway. what should i do? what should she do? how can i help?