I had all 4 impacted teeth taken out about a year ago. It wasn't fun, but it wasn't that bad either. Of course I also had no complications
Popsicles are the best. They're good for getting fluid and sugar in when you don't feel like eating, and they also numb the mouth.
Ice packs. Have her holding them against her face (or tie them to her face). 20 minutes on, 20 minutes off. Repeat. It'll help keep the swelling down. Do this at least for the first 24 hours.
Don't hesitate to give the pain killers. My mom didn't really want me taking them. By the time whatever they gave me during the procedure wore off I was crying from the pain. I took the minimum amount of Vicodin, and was off of it within a day and a half. I was on Tylenol for about a week though, for achiness. After the first day though, the pain was bearable.
The biggest issue I had was eating. The pain was bearable enough within a couple days for me to eat, but I couldn't eat because of the stitches. The food got caught and it just wasn't pleasant. Be prepared for her to be on a soft diet for awhile, even if she feels up to eating real food. Yogurt is really good. So is pudding, scrambled eggs, jello, applesauce, mashed potatos, mac and cheese and other (soft) pasta. I even found after the first couple days that if I cut up meatballs VERY small, I could handle those. Other meats didn't work very well, however.
Follow the dr's advice to the letter. THey should give you an info sheet of all the do's and don'ts. No straws. No excessively hot food (in other words no soup, tea, coffee, etc). You might also see if they'll give a prescription for an anti-inflammatory. My oral surgeon is the only one in the area that I know of that does this, but I was put on 6 days of a steroid (methylprednisalone or something like that), to keep swelling down. I swelled a little but nothing compared to my friends that went to different surgeons