I've noticed that straws tend to rest for several days before starting to eat the exo. Most of my other species seem to shed the exo one day, and immediately start eating it by the next day.
From my experience with straws, molting seems to stress them more than other species. That is why you hear so many stories about straws completely shedding their exo, and then dying before they ever begin eating the exo. I've seen this happen many times with my own straws, but usually only with their first molt with me, which could still be considered the PPS period.
The good news, is that your darling is beginning to eat the exo. Keep us posted on her progress, and congrats on the molt!!!
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