I've not had personal experience with any of mine laying slugs, yet, but I've heard and read that sometimes a female will lay slugs days, weeks or even months after laying the rest of the clutch :shrugs:
My instinct would say that may be why she has not eaten yet, and I know of some females that won't start feeding again until after their post-lay shed. My one female that has laid so far this year, laid her eggs on the 25th March and had her post-lay shed on the 5th April, but then she did accept food straight after laying :shrugs:
I would keep an eye on her and when you think she's done laying the slugs, try offering her a couple of fuzzies, as she might accept them more readily before going into blue for the post-lay shed. I would also try offering her a drink when she's done as well, as she may be too tired to go help herself.
How much did she weigh before breeding? If she was a good weight then she should be ok.
Good luck and best wishes,