Ple-Sen
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No, I would say their only chance is to bury the succubus under rubble. Two melee units, even without a direct assault (though they could have tried to surprise her)? No way. Or maybe she can't perform actions in the air, in which case she'll just have to fly away.
1) Don't burn the temple, eliminate the subordinates, and hope the succubus flies away or descends to the ground.
2) Burn the temple with all the subordinates and hope the succubus doesn't survive it.
Both approaches have their pros and cons, as you can see.