6 months after Gamma knife side affects

Hi there,
My daughter who is 12 had a ruptured AVM in Feb 2017 and then gamma knife to treat the remainder of her AVM in December. She has started to get side affects, which had cleared, return, such as chronic fatigue, depression, headaches and now a thumping in her ear.
Can anyone tell me how long these last for and when/if I should be concerned? I know to look for swelling of the face.
Thanks