Condition:

Swollen body (bloated stomach, rest of the body seems fine) --> it's not Dropsy, is it?
Doesn't move a lot
Has never croaked before but made a kind of strange groaning sound after the swelling occurred
Hasn't eaten or pooped recently

She started getting fidgety over the week and only last night she started to lean on one side, the other side is kind of swollen. Today, after I came back from school, she had become completely swelled up.

Does anyone know what the problem is? What should I do?
Thank you for your time!