That's a tough one. If it were me, the answer would be easy 'cause I'd insist both profiles be removed. Furthermore, there's no reason she should be talking with this other guy... period. If she wants to maintain an active Match profile, I'd feel that clearly she's hedging her bets.
However, I'll also tell you something about me. I've had 2 marriages/divorces and two long-term 5 yr relationships and I'm living alone now.
Are you sure you want advice from me?