Aretha had severe epilepsy, and surgeons removed portions of her hippocampus to control the severity of her seizures. it is quite likely that aretha will find that the surgery has also affected her ability to

It is quite likely that Aretha will find that the surgery has also affected her ability to "form new memories".

Explanation:

As Aretha had surgery and doctors removed a portion of hippocampus, it affected her ability to create new memories, because hippocampus which is located in the brain have a function related to memory. Hippocampus receives signals and send to the brain  via entorhinal cortex, so when a portion of it is removed it will affect memory.