You decide to convince her with the Ship of Theseus thought experiment.

You let out a long contemplative hmm to draw Sarah in.

“Have you heard of the ship of Theseus?”

“No” Sarah replies looking up from pages of proofs.

“It’s an old thought experiment from the Greeks about an old ship that as it grew older had each piece replaced slowly, one by one. Eventually over time, it wasn’t the same ship. Similarly, if you replace every element of Dini, it may be physically identical to the old Dini but it wouldn’t be the same hamster. There would be no continuity of consciousness from the original.”

“That’s an intriguing thought,” Sarah Pondered. “BUT! I’m not replacing the elements of Dini, I’m using the same elements to recreate a living Dini, so it WOULD be the same DINI, Ergo, I’m still gonna do it.”

Drats! That didn’t work, what do you do?

You’re messing with the natural order of the world; this could have huge butterfly effect consequences

The world is already populated with people and hamsters, shouldn’t you just take care of a new hamster?

According to the tenants of Darwinism, Dini being murdered by the cat means we should let him die and not re-enter the gene pool.

Oh, give up, lets help her bring him back