My Daughter (who is now 8), likes to read these since she was 7:
Rainbow Magic books
Diary of a Wimpy Kid
Swiss Family Robinson
Franny K. Stein books
Magic Tree House
The Magic School Bus
Junie B. Jones (my daughter read these in 1st grade).
My daughter does not care for the Judy Moody books.
Mostly, kids that age, may get intimidated by "chapter" books, because they lack pictures. Its a transition for them, to Chapter books, and yes because, it has many more pages.
Reading a chapter book a week, can be arduous for a child that age.
It was never required in my daughter's class/grade. At 7 years old, my daughter was in 2nd grade. But as a daily 'homework', the kids are required to read for 20 minutes a day. And then they take a 'test' on it. Their school uses the "AR" Renaissance reading/testing program.
In your daughter's classroom, doesn't the Teacher have her own classroom "library" which the kids can read from???? Most Teachers do.
It takes TIME, for a child, to read a chapter book in 1 week.
Unless they are a natural 'bookworm.'
Try and have her read anytime, take the book with her in the car and read, before bed, after school, when there is downtime etc.
Bear in mind, all kids in a class, are at different reading levels. And not all, at this age, ARE reading solely chapter books only.
Some "chapter books" are shorter than others.
So... my suggestion would be to get those types of books for her. So it is not as intimidating. And she can 'transition' that way.
The "Geronimo Stilton" book series for example, are Chapter Books, but shorter and with pictures and easier to read and finish within 1 week.
all the best,