yeah , kinda expected for her chances to be higher for longer. It would be impossible otherwise. As for stacking , i kinda doubt it myself , but it might work.I mean , she is a mage unit restricted by cost , and that could balance the power she offers a bit , but i kinda doubt it as well. Let's say you manage to get 2 Odettes out on a map and still manage to get their actives as well. That takes a lot of time and cost a lot. 3 should be near impossible on higher dificulty maps , and on lower ones , you won't need her skill anyway.