The correct answer to this open question is the following.
Unfortunately, you did not include a specific reference to know who "she" is in your question. Yo did not provide the text of further context.
However, trying to help you, we can comment on the following.
In general terms, some of the reasons people want to remove "Roll of Thunder, Hear My Cry" from schools is because many parents consider that this is a book written with offensive language, improper for the kids to read it.
Many parents think that it uses offensive language and aggressive terms, including racial slurs that do not consider proper for the school environment. Parents think that it talks about racism with harsh concepts and terminology.
