It does appear to have a severe case of dropsy. Sometimes Furan-2 and Kanaplex will treat dropsy but I have to agree with Colin_T that this is an advanced stage. If you want to try to get her to hang on until delivery, you may try giving her Epsom salt baths. Place her in a gallon of dechlorinated water with1 teaspoon of dissolved Epsom salt and leave her for 3 minutes. Then remove her. You can do this 3 times a day. She may go into labor. The salt pulls fluid off. That’s all I can suggest in her condition. If you weren’t planning to keep the fry then she should be euthanized although I use Clove oil.