couldn't have been not talking

[ostap77]

If I knew that my friend liked to blab about different things at a party, would the following sentence make sense?

"She couldn't have been not talking about it throughout the whole evening."

[bhaisahab]

If I knew that my friend liked to blab about different things at a party, would the following sentence make sense?

"She couldn't have been not talking about it throughout the whole evening."

The meaning is clear enough, but it's a clumsy sentence.

[ostap77]

The meaning is clear enough, but it's a clumsy sentence.

How would you say that you're almost sure she was talking about it?

"She can't have been not talking ............"

[bhaisahab]

How would you say that you're almost sure she was talking about it?

"She can't have been not talking ............"

"She can't have spent a whole evening without talking about it".

[Barb_D]

Or get out of this multiple negative morass: I'm sure she must have talked about it at some point in the evening!