Sorry to hear that! The babies look very slightly premature to me, having not resorbed their yolk sacs. Unfortunately almost the same thing happened to me last week, except it was my E. assisi - a bunch of slugs and 3 in the sac, fully-formed, but slightly premature babies that hadn't taken in their yolk sacs. It was sad but there's always next year and thankfully, like your female, the mom is doing well and is feeding well.

These are the babies, taken out of their sacs with yolk removed

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