When things are at their most desperate, Maeve can choose to unleash Other Maeve. For this ability to take effect, Maeve must have zero spell slots left. Once this condition is met, as an action, Maeve can choose to use her action to allow Other Maeve to take over.
Other Maeve will then manifest herself and join the combat for 1d4 rounds. Her manifestation is accompanied by a Wild Magic Surge. She can take her first action on Maeve's next turn.
Once the manifestation ends, Maeve will fall unconscious for 1d6+2 hours and gain three levels of exhaustion.