I was going to suggest pumpkin but you've already tried it.
I would have her anal glands checked again, it doesn't sound like a 'tail' issue, more like a butt issue, like maybe shes trying to reach her butt, can't so it looks like tail?
I think I'd start with the glands again,if they are full within a month, I would fathom a guess it's a gland issue..and go from there..
Hope you can figure it out
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