Betta with swelling

Now when a fish shows this much swelling (you stated that it's swelling
evenly throughout the fish's body and not just the belly area where one
would first think eggs), there is little chance for saving that fish.
However, you'll be wise to figure out why this happened to this fish
and correct it (if possible).
I would keep the fish in quarantine, and do a 40% water change on the
main tank she came from.

It isn't the entire body, just the "chest" area. How big would they get
with eggs? Seriously she is huge there and now she's having problems
swimming, she has to really wiggle in an exagerated manner to swim
someplace. We do have a male betta but he's kept across the room in a
smaller tank.

Klane