I think one of the best places to start is the The Read Aloud Family by Sarah MacKenzie. She is a homeschool mom of five and her recommendations for books are great but she also has insight into ways to incorporate books into your routine. My husband actually got the book first and suddenly all these fantastic picture books showed up on hold from the library. I asked him where they came from and he told me about the Read Aloud Family book.
The library is your friend here. If you buy too many things you'll be swimming in books your child will never wants to read again. I would recommend really working your local library system. Look up lists. Put things on hold. Take her a few times a week to check things out.
We discovered that picture books are great to read over breakfast. Even our 11 year old loves them and many of them incorporate into his science curriculum. It creates peace and joy in the middle of what could be a harried routine and one of our favorite things that homeschooling has introduced to the family.
We do chapter books at night. My five year old LOVED Charlotte's Web and Bunincula. We have started Mr Popper's Penguins but honestly no one's that into it at the moment. Winnie the Pooh is a huge favorite.
Check out School Library Journal's booklists for recommendations. I also utilize the Amazon "customer's also bought" recommendations (which I then input into our library website.)
Recent favorites: I AM BAT by Morag Hood, The Rules Of the House by Mac Barnett, Have You Fed The Cat by Michele Coxon and Fruit Bowl by Mark Hoffman.