My son was slow learning to read due to visual tracking issues, and the simple fact that his ability to read wasn't up to his interest level. Until kids cross the line into "fluency" (where reading is at the pace of a live story) reading is a chore, not fun. Sometime in 3rd grade my son crossed that barrier, and no one really knows how or why, he just did.
I would suggest patience and continued exposure to a variety of techniques and literary forms. She will find her road.
If you get a good aid, that can work out well. But the level of training among aids varies a lot. Some can really help your child move forward; others are a buffer, and not much more.
Definitely mention the memorizing observation to the resource teacher and other experts your child works with.
_________________
Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).