My RIR hen is 9 months old. I noticed her acting a little funny last Sat. Did not think to much about it because we did alot of work around their house. But on Sunday I let the guinea's out and she did not chase them. So I stood watching. She would not eat. I picked her up and felt a lump about the size of a golfball in her crop. Came on here and did research. We have been giving her Olive Oil. Massaging her crop. When we give her the olive oil and massage she throws it up. It smells sour. The lump is getting smaller but she is still not eating. All she does is drink. She is beginning to walk around more. Does she need surgery or should we wait? I don't want to do surgery unless needed. Any advice is most appreciated.