Since she is a relatively newly diagnosed cat, I would try the reduction. Since you know she is bouncing, you could try a trick we call shooting through the bounce, where you shoot the old higher dose once, before reducing back the following cycle. This can help the bounce a bit. Note, for cats who don’t bounce much, this isn’t a good idea.
We don’t want to hold the dose until we see hypo symptoms. We prefer to call it a low numbers event. Some cats don’t show hypo symptoms until way too low. Holding a dose where she goes can be dangerous if her pancreas is healing.