Watch her body language.

* Is she rubbing her back? Give her a massage.
* Does she look uncomfortable? Try helping her get comfortable.
* Are her lips dry or is she licking her lips? Give her a drink or ice chips
* Is she sitting in a position where her toes are down and ankles off the ground? Place some pillows under her feet so she doesn't get cramp.
* Does she look frightened? Reassure her that everything is okay
* Is she tense? Run your hand down her shoulders or jaw and tell her to relax
* Is she taking shallow breaths or holding her breath? Remind her to take deep breaths and that her baby needs the oxygen
* Is she looking around the room and restless? Give her something to focus concentrate on, her partners eyes are a great one and they can breath through contractions together

I could go on forever LOL...