Lut, I'm so sorry she hasn't come back yet - where did you see her last? If she's out, something may have scared her, perhaps try to go out again before you go to bed, often cats will show up in the middle of the night after an adventure outside - Fister did.
Is it possible that she could be locked in some cupboard in your house?
If someone has taken her, they may find she's a bit much to handle and hopefully will let her go.
I really hope you'll find her!
(((hugs)))
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