I may be in the minority and I apologize ahead of time for being judgmental but I am actually horrified that a 9 year-old is required to sit for 1 1/2 hours after school to work on pre-algebra or 5th grade math when she has clearly indicated that she doesn't want to go. If your DD progressing in math is so crucial to you, then at least give her things to do that she doesn't hate. There are many interesting books about math and mathematicians if she reads well so perhaps shift gears in that direction. It is also less horrifying (at least to me) if you are forcing her to do a 1 1/2 hour class in the summer when she hasn't already had a full day of school.
