Another explanation is that your daughter is slowly but surely making the difficult adjustment from a self-contained special program to the environment of the regular class. The regular class might simply be more challenging than the SLD program. The fact that your daughter's grades have improved a bit is a good sign. I hope this trend continues. You should be aware that having a learning disability should not impair your daughter's chances to get into a good college.
Many colleges have excellent programs for students with learning disabilities.
Descriptions in a college guide book will include this information, or your daughter's college counselor can help you. The past seven years of school have been a constant fight with them. In order for the school to get my son, who has ADHD, into special classes, they want me to sign a paper saying he's mentally retarded. The school said it's the state that makes them word it that way.