The match will continue until either the single combatant or both members of the tag team are forced to submit by declaring that she is the "weaker witch"
Spoiler
She wasn't worried for Wendy Waterbridge by any means. Anyone who was haughty enough to challenge two opponents to try and claim the name as the best witch in L.A.W. (nevermind that Mona didn't claim to be a witch herself, it just came with the territory of wrestling alongside Lisa) deserved what was coming to her.
What was coming to her was being forced to admit to the huge crowd here in the arena and at home that she was an inferior witch.
It just made Mona, a superstitious person anyway, suspicious while she walked down the ramp, spreading stardust.
Lisa was all smiles, and Mona decided she shouldn't worry either. Wendy Waterbridge stood no chance! And she was crazy, Mona decided, and she should know as someone who had done some crazy things to get noticed in the ring. What was she going to do, cheat? Conjure a sledgehammer from the skies? Ha!
These thoughts comforted her as she sprinkled the last of her stardust in the ring and sidled closer to Lisa, posing for dramatic effect for the crowd while her curvier partner blew kisses to their growing throng of fans.