Still, it's necessary. One of my characters *had* to change motivation. She goes from hanging on in the periphery to being right up front in the action. She has good reasons to show up where and when she does. To do the things I wanted her to.
Of course, she also has good reasons to go off the reservation on me. Her acting in her own best interests is having bigger consequences than I thought. Oddly, she gets more and more with the rest of the program in the second half of Act II. But changing this one subplot turns out to be a bigger deal than I thought.
While looking for that bloody splatter, I found this little gem: