Hmmm...it could be a number of things. She might have gone lower than she's used to and be bouncing up. She could still be feeling kind of stressed from the dog thing. It could be what we like to call "oh look a squirrel!" syndrome (basically, something could have excited her in some way making her numbers high...this one means it could be something completely unrelated and that we don't know about but it isn't necessarily bad). Being vigilant about ketones is important, but remember that usually, if ketones are present, kitty will be lethargic and not eating. Ketones usually come from high numbers + not enough insulin + infection. They can develop at high numbers which is why we urge testing, but that doesn't necessarily mean they are LIKELY. If you got a test this morning that was negative, she's probably still negative. Couldn't hurt to get the test for your peace of mind, but I wouldn't stress too much.
Remember to breathe. I know this is stressful, but really it's just one number and one cycle. I wouldn't get worried if she was mine until it became a trend.