Maybe just sending a card would be fine, maybe even better, to start. It lets the person know that you care and are thinking of them. If you don’t really know what a person with Parkinson’s and who is recovering from two brain surgeries wants or needs, a card is probably best. Once your friend is home and there’s some idea of what her level of functioning is, if it was improved maybe, by the procedure, then maybe you can send a gift. Others may have a different opinion.