thank you for sharing what your daughter has been experiencing. I understand how concerned you must be for her. I have four daughters and three of them experience migraine and their symptoms. I do not have any experience with the type of persistent aura that you are describing other than my own periods of seeing shooting stars or snow as an aura. My symptoms are not as long-lived as your daughter's. I did some research and there are two types of persistent aura conditions. They are Persistent Migraine Aura without Infarction(PMA) and Persistent Primary Visual Disturbance (PPVD). These are conditions where an individual has an aura that lasts longer than a week with no migraine headache(infarction). These may be worth bringing to your neurologist's attention to see what their thoughts are regarding what your daughter is experiencing. These conditions are not common, but with migraine disease, anything is possible in my opinion. There are not a ton of studies out there covering prolonged aura, but there are some you may wish to take a look at prior to your doctor's visit. Even if it is not what she is experiencing it is a good idea to discuss your thoughts with the doctor. Here is a link to an article that covers prolonged aura.
https://www.ajmc.com/view/prolonged-aura-in-migraine-is-frequent-similar-to-other-auras
Please keep us posted on how your visit goes and how your daughter is progressing. Wishing you migraine-free days, Tom migraine.com team