If you can't feel an egg by doing an internal exam then it may be a shell less egg in her system. They are really difficult to pass and it really can knock them out of sorts. A direct calcium supplement to help with contractions and boost her shell gland for the next eggs coming through and just make her comfortable and give her time.
gave her a bit of baby ibuprofen and a nice soak.. tucked her in for the night.. now all I can do is pray she passes it in the night. Oh and I did another feel for the egg and I still can not feel anything. 
