In thinking about your question, I'm trying to picture the reasons why reading at home might be different from reading at school.
Your daughter's reading level may be above the level of the books that are being given to her at school. That could be one reason why she feels bored.
At school, if the class is discussing a particular story, they might be spending a lot of time talking about it, and less time reading it. This could be boring to your daughter.
Many times children say they're bored when, actually, something is too hard for them. I don't know if this would be the case with your daughter.
At home, she chooses the books she wants to read. At school, they are often chosen for the students.
At home, you and she have time to sit close to each other, to read and share a book. At school, she's with a group of people (large or small) and she has to wait her turn to say what she wants to say and read what she wants to read.
You could ask for an assessment of your daughter's reading levels, by a reading specialist. Sometimes, schools have a qualified person at the school who can do this. If the school doesn't have an in-school person, they have access to a district reading specialist who can do this assessment.
You could discuss with your child's teacher the reading level of the books that are being given to your daughter in the classroom, and compare this to her assessed reading level. Your daughter's teacher, herself, may have done an assessment of your daughter's reading level. You and your child's teacher will want to match the material she is reading at school to your daughter's reading level.
The above matching is critical. Also, of course, it's important to match her interests to the books she reads. In the classroom, it's not always possible to do this matching, precisely. But at home, you can match reading level and interests very easily.
By the way, a quick way to tell if a book is at a "just right" reading level is to do the 5 Finger Test. Count 100 words in a book. Have your daughter begin reading. Each time she doesn't know what a word is, put down one finger. If you bring down 5 fingers, then this book will likely be too hard for her to read by herself. If it seems too hard, and yet she's interested in the book, then you can read the book to her.
For instance, the children's book, "Charlotte's Web", is written at a junior high reading level, and yet many children in the early elementary grades are interested in it. This kind of book can then become a listening book.