Things appear to have settled down between the girls this evening, much more quickly than I'd thought they would! Sparkler seems to be back to being her normal self, and Tinker is exploring all over. (I have many things I'm going to have to move around or conceal, because unlike Sparkler or Galaxy, Tinker can and does go everywhere.) Earlier they were both resting nearby, Tinker on the floor next to my chair here, and Sparkler on the floor maybe six feet away. No growls or hisses, that I could hear anyway.