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OK… I was hoping to avoid that, but your advice that it’s necessary is appreciated.
I want to add one further insight, just in case it prompts any other thoughts.
Squeak and Sylvie both jump up on my desk at times. On Monday evening they were both there at the same time: Sylvie to the right of the monitor and Squeak behind it, where they could see each other but there was no unobstructed line of sight (or line of attack) between them. Squeak clearly thought that Sylvie was invading her territory, and was looking at her intently: “We’ll be watchin’ you, stranger!” Sylvie was standing her ground and growling repeatedly. Each time she did that I distracted her by petting her. When I stopped, she growled again.
This made me see the problem in a new light. I thought that Squeak was the aggressor, as when she chased Sylvie back to her room and cornered her there. I thought Sylvie was being the wimpy kid who folds like wet cardboard when pushed. But apparently Sylvie is feeling some aggression too, and I now suspect that when the two of them have a confrontation, they mutually escalate until a fight breaks out!