I mean, she probably could do weather stuff, that's easy if you've got wings! But I don't think Cálice was ever human, that doesn't really sound like her! Every time she shows up, she's always all "RAAAAAAA I'M SO MUCH BETTER THAN YOU CAUSE I'M SMART AND I ATE A WORLD AND STUFF RAAAAAAAAGRGLE FRIENDSHIP STIIIINKS! so she's probably too busy being stuck-up to go try things!"

[This impression accompanied by appropriate mock-scary gestures.]

Just like that! Iiiiiiiit's a whole big thing!

But yeah! Ponies can TOTALLY eat cupcakes! And some ponies can eat a whole lot of cupcakes! Like, forty! That's as many as four pans! Don't do that.