The anaesthetist should be able to give her something prior to surgery if she is anxious. Also, don't forget to let him/her know if she has suffered from nausea after anaesthetic in the past. My other big tip is to keep up the pain relief, but also make sure that constipation doesn't get the slightest look in. And if she's staying in a couple of days and the hospital has a garden, take some easy slip on footwear and a decent dressing gown - you're supposed to get up and walk and it's much nicer to do that in a garden than it is to do laps of the corridors (make sure the surgeon gives permission).