All those toys and Luna chooses a thick ziptie.

My cat loses all his toys.
And so far he's rejected the stuffy I bought him in hopes it would make him not feel so alone when I'm gone or need to do something.
He follows me around almost all day long meowing and only happy when we're cuddling on the couch which I can't do 24/7.

It's all about the texture and bite force. Fluffy toys don't feel the same.
They like tug-o-war for similar reasons, beyond the personal bond and play it strengthens the teeth.

If she has puppies I want one.

Make sure she doesn't swollen it

she's just figuring them out so she can hold you ransom for biscuits.

Best hope she does not discover how to use it...