Notice the belt of yellow fat around the base of the shell? It would indicate that she's in a very delicate condition, and pretty close too.
6 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.
You can hear this line at 00:44:24.361 in the DVD version of the movie.
Quote context
[...]
- The sides of the pit were glazed as if the rock were melted.
- Why?
- Looks like we're on the verge of a blessed event.
- Or is this the one you killed?
- No, it is still alive. We did not kill it.
- I, for one, should not like to be around to hear the patter of so many tiny feet.
- Kill it?
- It's easier said than done, Hank.
- Now wait, this needs some thought.
- Doctor, you're not going to suggest that we save it for science. That would be suicide.
[...]