Hmmmm....I spent some time studying your SS just now and I do think you might be seeing some bouncing. However, I'm not sure I'd reduce just yet. My reasoning is that while you did get 2 dives 2 days in a row, they were on different doses. We've seen some cats who simply just have an overreaction to a dose change that causes that dive...no idea why. Since then, Little has been higher, but there have been drops happening. Today, so far, she's gotten into some nice blues from a pink preshot. To me, this says that there might be some light bouncing going on, but she might need some time to allow that dose to work. That seems to be her pattern looking back some...a few days on a dose and she starts hitting lower numbers mid cycle. I think if she was mine, I'd stick with 2 units for a few more days and just see what happens.
I can see the case for reduction from what Djamila said, but just from what I'm seeing on your SS, I'm thinking holding might be a good choice.