Sour Crop and Health Issues

My hen has Sour Crop. I need some suggestions on how to treat her. She s had it before, and I finally got it cured. She had it from eating too much wheat grass that grew in my yard. This morning shehad a full and squishy crop, poor girl! I decided to go ahead and get the gunk outta there, so I vomited her. She doesn't like it! She has had a squishy crop for a few weeks. She also has not laid in about a month There is also a small lump there and her buff is really messy.
thanks!!