Nat Mur is an excellent remedy for cats--because of the incidents of separation which seem to befall all cats. They are all separated from their moms (and make their human companions who feed them into surrogate moms) and all of them mourn the absence of their siblings and any companion at all.

I would suggest a dose of Nat Mur, at possibly a 30c if you have it on hand.

So sorry to hear about the kitten's passing.

Divina

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...and deliverance has many faces<br />but grace<br />is an aquaintance of mine