Before any donations are made though, I'd fully recommend holding onto the donations until the surgery and the followup is over, just in case something goes wrong and a followup surgery is necessary, or unexpected expenses related to the surgery come up that nobody's thought of yet. Or, on a more pessimistic note, Allison needs to continue making rent and eating while a malpractice suit is filed, in a worst-case scenario.
I'd also suggest ponying up a bit extra for a private (AKA Single Occupancy, etc) room to recover in while she's in the hospital, unless this is an outpatient procedure. I honestly can't too many donors begrudging her of that creature comfort.
Finally, I personally support donating whatever's left over to the next Desert Bus For Hope event. What better way than to celebrate the gaming community to come together in support of Allison than to make the Loading Ready Run crew suffer just a bit longer than they otherwise would? :-D