Continue the moist heat and give her another calcium tablet today. The calcium is extremely important in this type of crisis. It may mean the difference between a stuck soft shell egg and a hard shell egg that can be pushed out. The moist heat lubricates and relaxes tissues.
Then provide plenty...
Start her on the penicillin. It's a good precaution if the egg did break inside her. As @micstrachan recommends, rig a heating pad for her and place a moist bath towel on top of it. Let her rest on this moist heat, set at low.
A calcium supplement will help with the contractions and if there is...