Please help! Is a lump of squishy fat behind her legs and green liquid beside her poop a symptom of water belly??

[Yosha]

Please help!
This has been happening for awhile now, but the green liquid issue is becoming more often and I don’t know why. She eats a good duck feed and has chicken or salmon everyday, so there’s unlikely to be anything wrong with her diet.

 

[DotToDot]

Is her belly swollen and pushing her legs apart? The green sounds like it would be part of the poop.