Or use one of the two cheap ways.

1- Have Quina with exactly one HP, and have it use Limit Glove. When Quina has 1 HP, Limit Glove causes 9999 damage, ending the fight. If Quina has 2+ HP, Limit Glove misses.

2- Do nothing. ABSOLUTELY NOTHING. MAYBE you will want to keep Stealing from her. But you can do nothing, just revive deas members. After a ceratin amount of time, the battle ends.

Beatrix WILL win this fight, either way. Don't worry, you won't get a Game Over.