I think it all depends on the cat...
I have 2 cats and they are awesome with smaller animals... Wilson basically ignores them & Wiley is fasinated by them, but in a good way. He will lay beside their cage for hours and watch them... but he's never once tried to swat at them. They are in the same room everyday (I have my chins in the livingroom)...
When I put the chins in the bathroom (one at a time) for playtime, I have a board across the doorway so I can check on them quite often. Many times I have gone to check on them and found Wiley has jumped over the board and is in there hanging out with the chin. I always remove him immediately but that's only so the chin doesn't feel threatened.. I trust my cats completely.
This is the cat that brought my hamster to me in his mouth

when the hamster escaped from his critterball. Not a mark on him.. he just wanted me to take care of my little escape artist.
So... I'd say it's not totally impossible to have cats & chins in the same room but since this person's cat hasn't been exposed to smaller animals before I'd tell her to be cautious and only let them together while supervised.