I think these are very wise words. Exercising caution is necessary since Debbie has been allowed, if not outright encouraged, to grow a humongous sense of entitlement within herself, so retaliation would be the most natural response for her.

I am even thinking that some preemptive measures MIGHT be worth considering.

There was that girl in the movie "Charlie and the Chocolate Factory" whose mother constantly fed a sense of entitlement in her; do not remember her name, but hopefully everyone knows whom I am talking about. Debbie could play that role just like that.