Signs for Shed Intervention/Worrisome Behavior

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I guess the question is how long do I wait to interject and give her a soak or another method at persuading her to come out of her old skin?

You never need to induce a shed. Your snake will shed on its own, when it needs to, in its own good time. You would only soak if your snake has shed, but not completely. Then, you can soak it to help it remove the stuck shed.