Reddit reviews Schaum's Outline of Probability and Statistics, 4th Edition: 897 Solved Problems + 20 Videos (Schaum's Outlines)

Khan Academy, free.

If you want problems and answers, I highly recommend the Schaums guides. You’ll need to pick the right one for her level, but basically there are a lot of problems and answers to help understand the issues.
https://www.amazon.ca/Schaums-Outline-Probability-Statistics-4th/dp/007179557X

Schaum's probability and statistics was enough for me when I was a physics undergrad.

Schaum's Outline of Probability and Statistics is a good review with lots of practice problems. Check out the videos on Khan academy too, they really helped me with some of the concepts.

This might get poo pood, but I really like some of the schaums outline books.

https://www.amazon.com/Schaums-Outline-Probability-Statistics-4th/dp/007179557X

Why? They are packed full of sample problems and answers, and they tend to provide really concise definitions. I think one of the better ways to understand conditional probability is to see it applied to a range of clear examples.

Also, these books are ridiculously cheap. Tiny investment to make on the off chance you don’t love the format.

I still use this book to quickly brush up on specific concepts at least once a year.

• Schaum's Outline is a good start
  https://www.amazon.com/Schaums-Outline-Probability-Statistics-4th/dp/007179557X
  
  
• Probability Through Problems
  https://www.amazon.com/Probability-Through-Problems-Problem-Mathematics/dp/038795063X/
  
  
• Problems in Probability Theory
  https://www.amazon.com/Problems-Probability-Mathematical-Statistics-Functions/dp/0486637174
  
  
• One Thousand Exercises in Probability
  https://www.amazon.com/Thousand-Exercises-Probability-Geoffrey-Grimmett/dp/0198572212
  
  It's a good idea to abuse the library if still in school.

I know this is a boring suggestion, but nothing beats the old, venerable Schaum's Outlines for their combination of problems, solutions, and inexpensiveness. If you are just starting, perhaps start with this one, and once you get some exposure to the basics you'll have a better idea of what you might want to pursue next- perhaps the next step would be analysis using a computer instead of by hand.

Lots of us have free YouTube videos on the basics that you can reference if/when you need them as you go. Try me or Kahn Academy, there are many others. Let me know if this idea doesn't fit with what you had in mind, and I can try to point you in a different direction.