It seams likely to me that either Jillian is not under the influence of a suggestion (and Wanda is keeping a secret), or that Jillian will try to kill the dwagons but do it in a sub optimal way. We know she's already weakened herself by sending two commanders away. So she has several options to weaken herself further.

Considering the possibilities, she could decide at the last moment to scout more area, and split forces again. For example she could send the archons in one direction (to guard Ansom), and her gwiffons into another. Then a weakened stack of gwiffons and Jillian fly into a stack of 19 dwagons and 3 warlords. That's something her suggestion could make possible as a brash action, and she would be attacking with a minimal stack against foes who have 3 warlord bonuses and the maximal stack bonus. In such a situation, she'd croak a few dwagons, then herself be croaked. Consider how turned based warfare works... She and her stack of 5 gwiffons get 6 attacks, and take out 6 dwagons... Then the counter attack is 13 surviving A-dwagons and 3 warlords take her out. Heavy losses on both sides, but final victory for Parson.