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I would just leave her be. My rosie went into premolt late March and finally molted early June. She webbed herself inside the hide more than a few times and broke it down to get some water. Finally she webbed up her hide a fourth and final time and took approximately five hours to molt from time she flipped over to when she exited her cave again.
1. Maybe. Most likely If it did, the cricket would be a goner soon. It's possible that it bit the cricket to defend itself. Use a pair of tweezers and take the cricket away even if it seems to be dying. A tarantula in premolt is very vulnerable to the bites of crickets. Premolt tarantulas won't eat anyway.
2. Their venom liquifies their prey so they essentially drink it leaving behind a bolus of wings, uneaten parts, etc
3. Yes. She will tear it down and rebuild it as needed. If she is webbed inside, a molt is likely to be coming soon.