when they were originally implemented, they triggered upon her saying "heart" or "wink". she doesn't really do that as much anymore, but this would be the perfect thing to use the new upgrade on. it would work the same as flipping does.
honestly it's probably an obvious suggestion so sorry if im repeating things. i'm posting this because don't remember hearing vedal mention this specifically, despite discussion about her controlling toggles (which i assume means just the channel point redeemable ones).
another (probably also obvious) step from there would be to implement her being able to change expression, as the model is definitely capable of that, to prevent her getting "stuck", it would have to be temporary, or persistently conveyed to her if the expression isn't currently the default