I've had her multiple times for multiple courses (100C, 102A). I don't understand why they still let her teach.
She has plenty of positive reviews but I think they're largely because the people writing them are not stats majors. I can see that she would be a good professor if you'd like things really simple or generally aren't mathematically inclined. But that being said, if you would like your professors to speak to your level, be logical, make sense, or understand what they're teaching (especially at the undergraduate level), Juana is not for you. She's nice but she's infuriating. Her questions on homework and in tests don't make sense. Her notes aren't proofread (such as, she didn't run her code before class for 102A, so wasted a lot of time during class troubleshooting her R code).
She may be great for Stats 10 (I wouldn't know, I didn't have her), but seriously, for upper division, wait a year and see if someone else is teaching it.