Nurses and doctors don't usually worry about a temp or even consider it a fever until it reaches 100.4 (it's not treated in most hospitals unless it reaches 100.4), but she should report it to her doctor anyway.
I've had the same problem lately...maybe it's just getting older? You can drink water between drinks (if you can remember!) and that helps some. I also tried to change from beer (which I usually drink) to mixed drinks and the hangovers seem to be less severe. You can also try antialcohol...