Tbh batteries dying out of nowhere are the worst, right? I had my truck do that once in the middle of a date, talk about awkward. Anyway, with your car being three years in and not driven much on weekends, it's probably just not recharging enough from those quick trips to school. Cold weather zaps the power too, makes it hard to start. Your dad might be onto something with the alternator, if that's not working right, the that model starves.
To keep it from stranding you again, maybe start by having a mechanic look at the alternator and that model together. Turn off everything when you park, double-check that. And try driving it a bit more, like take the scenic route home sometimes to let it charge up properly. If it's really cold, a blanket over the hood or something, but that's old-school. Laugh it off next time, we all been there.