Ok people, you are going to scare the hell out of her if she reads this.
Here is what I know(I got mine done when I was 22)
-It sucked, but I lived to tell the tale. Vicodin is nice.
-Try not to eat anything that will get stuck in there...(I ate rice and mac and cheese one day, but it got stuck in the little holes so I had to clean it out with the little syringe type thing they gave me, but you have to do that anyhow with my Oral Surgeon.
-Have some soft foods like applesauce, etc... on hand.
-You may be just fine within the day, who knows as it's different for everyone
-The swelling is usually not that bad until the 2nd or 3rd day after it is done.
Bottom line is that it's not a comfortable thing, but you will do fine. My a-hole ex wanted to go watch the Tyson/Holyfield fight the next evening and kept bugging me to go with him to his friend's so I went and felt like crap. What a jerk. If you feel like crap, stay home!
*edited to add: I recommend getting all 4 done at once. If I had to go back and do more there is no way I would want to, orthodontry be damned.