If by "Peace plant" you mean a Peace Lily, do not allow it around the cat period. All lillies are somewhat toxic to cats.
I gave up trying to have plants around cats...if my boyfriend gets me flowers, they go in the bathroom with the door closed or they get eaten.
You could try having succulents/cacti, or maybe decorative hot peppers? Some of the purple hots are really cute! Poinsettias are actually safe, but contain an oral irritant that makes them froth at the mouth, so that might be an option. Other things you might try are marigolds or geraniums which are safe if kitty does eat them, but are pretty strongly scented and may be repellant to some cats. Whatever you bring into the house should be non-toxic, in case of accidents.
Edit: I looked up "peace plant" and it looks like it is not as toxic as a true lily but causes oral irritation due to calcium oxalate crystals in the tissues. Drooling and foaming at the mouth are common signs, but it is not life-threatening.