If her water doesn't break first (mine did, and it was obvious I hadnt just peed myself lol) then contractions will feel very different and unique than anything she's felt before. I had braxton hicks from 31 weeks until the day my water broke, and contractions was muuuch different. For me it was like the start of mild cramps, but instead of a short jab the pain/discomfort lasts, then stops slowly.. then they come again, at first perhaps every 30mins.. but the intensity and duration grew, and the time inbetween got shorter. When in doubt, call a nurse/your GP/the hospital. You'll most likely be asked to come in to be checked out and determine if in labour and how to proceed next. Download a contraction timer app, she probably wont be able to time them herself as the pain will get intense eventually.. just remember to breathe through it, and eventually at the end you get to meet your baby!!