Thanks a lot for your reply!
Just a follow up: my application deadline is December 1st. So if I wait a week to email her, it will literally be around 5 days before the deadline. Will professors frown at such a late email?
Also, instead can I email her after submitting the application? I'll write an extremely personalized email telling her I am interested and tell her I've already submitted an application, so look out for it or something?
I feel so terrible for making that mistake! I dont know how it slipped my notice.