When you are in true labor you know since the contractions are very painful and come extremely fast. Everything else seems like no big deal until that moment.
For both of my children, I had really bad back labor, but my sister didn't have any back labor. She said that her labor felt like having period cramps only a lot stronger. Are her contractions coming on a regular basis? Are they causing her any pain? How long are they lasting? True labor will have contractions that last for about 1 minute (If I remember right,it has been 11 years since I had my youngest :) Have her drink a large glass of water to make sure she is not dehydrated and then have her lay down for a bit to see if this ease the contractions. If nothing helps or they get stronger or closer together, I would call the DR back or take her to Labor and Delivery to see what is going on. Good Luck!! Kasie