It looks like there is a big lump even under her chin? That's not egg bound, it's probably something much more serious. I would quarantine here ASAP.
Crickets are not the problem.I also have 4 auratus together and I have one that is about that fat/bloated but not like that under her neck, I would stop feeding her crickets if she has become like that after eating pin heads during the last couple weeks.
Just my 2 cents, Curtis