I would bring her firstly to a developmental opthamologist. Find one in your area at covd.org . They would check to see is she has any visual / vestibular issues and give you a lot of answers. Click on "About Vision & Learning - Symptoms checklist" to see if anything fits. It's in the left column.
My son has convergence tracking issues and reads just like your description of what your daughter does. Guesses at words, confuses words, etc. He is actually reading two sentences at once in his head...one to himself and one out loud??? He is in PT for visual and vestibular issues. It was totally worth the evaluation! p.s. He did not need glasses; he just needs to do exercises, physical and visual.
