I think the "eggs" you were seeing were not really eggs at all. They may have been spider mites. That may be the case considering that you mentioned some weblike substance on the plant. This answer is just an educated guess because I've not read your old post and I haven't seen any photos of what you're referring to.
As for crown rot, depending on how bad the rot is, yes, it will decimate a plant within a week. However, if the crown rot doesn't kill off all of the meristematic tissue hidden deep within the central leaf axil, then the plant does have a chance at recovery.
I suspect the yellowing leaves are because the potting media is staying too wet for far too long. I really do recommend a repot somewhere down the line soon.
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Philip
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