@bulldogs4me - I really like what @kazzy220 said; and her suggestions are from years of Foster EXPERIENCE -- not just book learnin' and a few kookoo dogs --- like me.
The best you can do is continue to watch what triggers Destiny and continue to disagree with the behavior and thus, squelch the trigger before the outburst, if possible. The anxiousness you MUST feel when the dogs are together is surely detectible (of course it is!) so being your most calm assertive self is the best counter to that. Say, have you thought of keeping Destiny on a drag leash? In this way, she might think you have more control than you do. (Bo thinks he cannot move forward when he's got a drag leash on -- it's hysterical - even when I TRY To get him to move...LOL) Then you have access to grab that leash and JERK to correct which will throw her off balance and thwart the outburst? Just a thought to try.
I love the visual of sweet Chance sitting there, waiting for his bath too. Sweet Angel, he is.