Is my chicken egg bound?

Hello I was wondering if someone could help me with my hen. She is a Japanese bantam and just barely older than a year. She is in a flock with all silkies and she has never gone broody and has been known to lay a lot of eggs. Yesterday and today she has been just staying in the egglaying place with my hen crystal(she's broody). My Japanese bantam will growl at me and puff up like a broody hen but when I place a egg in front of her she doesn't scoot it under her like a broody hen would do. When I felt near her vent for the egg it didn't feel like she had one. I don't know what to do. I think she should probably go to the vet. We gave her a warm bath and oiled her vent area. I don't know for sure what I should do.