That one really looks like a balloon. Shark on shark vore is an interesting concept and something happening quite a bit in real life. In this picture I like the caudal fin sticking out of the maw the most.

She was about to finish her meal, with the caudal fin of the last scalloped hammer head flicking around furiously in front of her snout in a vain attempt to safe its life. She had known that these pelagics tended to visit the reefs from time to time to feast on the plentyful fish, but until now she would not have guessed how easy it would be for her to sneak up on them in an uncaring manner only to whip around and swallow them whole one after the other. A tactic she usually practiced on reef sharks until she grew to a size at which everything at the reef regarded her as a threat. The fourth and final hammerhead seemed to disagree with her bloated stomach and she felt a little sick from so much prey struggling inside of her. Maybe the tail would just stick out of her jaws as a warning for everyone else until enough of her belly's occupants were digested so she will be able to finish her feast in a day or two.

I think she would be able to force the last one down, if she's already stretched that much I'm sure she can stretch just a little more.

Probably. No shark is this stretchy though. But there are cool examples of a 3m tiger shark eating a 1.5m reef shark. 3.2m hammerhead eating a 2.2m lemon shark blabla. They are stretchy alright.

Oh yeah, sharks are quite stretchy preds, even in real life! I've been surprised by the kinds of things one can fit down its throat if it's determined!