|She's in berry!|
Each one of those little reddish "grapes" is an egg, and there may be as many as 11,000 of them tucked into her abdominal region. She'll be carrying them, tending them, combing and cleaning and fanning them, for several weeks. When they hatch, they will be tiny swimmers for a few more weeks, before the survivors settle on the sand as pinhead crabs.
Only a few will survive, even in the best of conditions. Good thing, or we'd all be drowning in crabs.
(Previous crab in berry posts: Babies, In Berry (w. video), Mother of thousands.)