When my RIR (Sissy) gets eggbound, her bottom usually feels really tight. She is probably about a year old and I don't think she grew up under optimum conditions.
She makes noises that indicate to me that she is uncomfortable. Sometimes just a gentle massage (working from front to vent) eases her. This last time, she still didn't lay the next day. I decided to give her a warm bath. I wanted her to relax and lubricate. She and I went into the tub together and I added vitamin e oil to the warm bathwater. I made sure she felt safe and rubbed the oily water on and around her vent. Afterwards I wrapped her in a towel and put her in a box in a semidark closet for about an hour. I let her back outside with the rest of the chickens, where she appeared more comfortable. The next day I found a huge, soft and broken egg in the chicken yard. and Sissy was not crying any more.
D