If you feel up to it, drain her yourself as shown in the video I linked earlier.
High production hybrids will usually not recover from the severe conditions that cause ascites/water belly and the way to prolong their life and give them some relief is draining the accumulated fluid to remove...
Could you upload some pictures of her full body and just lower abdomen for us to see how far her condition has developed?
Does she have trouble breathing, resting a lot?
How old is she?
When did she last lay an egg?
When did you last deworm and what did you use?
You can give her a bath in warm epsom salt water to clean her butt. Dry her well with a towel and blow dryer before putting her back outside.
If it is water belly/ascites this is how to drain her and...