Your fiances family are responsible for their "change" of plans, they now need to be responsible for their cat!
And pay for any services, that a pet sitter, or boarding would cost!
You need to be completely honest with your fiance's family...
This isn't a good situation for you or the cat!
Your physical health, and the cat's mental health...
She can't be locked away like that, without contact, plus there is to many things, that the stress she'd be under could cause health wise...
You, or they, need to find a professional pet sitter, that can handle this poor cat, long term.
Check through any shelters, there might be someone willing to "temporarily" foster her, for the owners.
I feel for both of you!
It's turning into a nightmare for you, and it could well turn into a nightmare for the poor cat, that's caught in the middle...through no fault of her own.
"A Cat must have three different names:
An everyday family name; A particular name;
And the name but the Cat Himself Knows, and will never confess." T.S. Eliot
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