She doesn't teach her class. She will give out papers and not even tell you what to do with them, then the next class when you don't have the work sheet completed you'll get a zero even if she didn't tell you what to do. Maybe if you use the textbook and do everything she hands out to you and possibly stay a bit ahead of her in sections you'll get good grades. She's a terrible teacher but maybe she wasn't always this way, I'm sure at some point she was a lovely person that used her knowledge.
Do not take AP Calc (you won't be ready for the AP test). Take DE if you must take it, but know that you'll have to retake at least Calc II in college if you need it. She's AWFUL.
Tough teacher, but man, that lady knows what she's talking about.