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. My daughter has ADHD and takes medication for it while in school. She just started eighth grade for the second time. Last year she failed everything but science and gym. I don't know what to do.