With both kids, we were told no food for wifey...Recommendation- on the way to the hospital, stop and get her something to eat. She won't be able to eat until well after the baby is delivered(and placenta is delivered, and any stitches which may be required are finished). If this is your first, this could be several hours.
Like Jillybop said, labor is a very intense experience for some women, so she may not want something too heavy(never drank Surge, just basing it off other MRPs). If you go with the Surge, I would make it kind of thin so it is easier on her stomach. You don't want her nauseous and vomiting during labor.