Looking at your updated spreadsheet, I see a high flat curve last night. That could indicate too much insulin, but not necessarily rebound. Rebound "usually" has highs and lows. Either way, you might consider reducing the dose, but as I said on PZI, you would want to test for ketones consistently as your kitty has recently had DKA. Also be sure she is eating and drinking.
Donna, I think that rebound is not seen often with Lantus because of the shed. We still think we see kitties who "could" be in rebound on PZI as it is a 12 hour insulin with little overlap. Never sure whether to call it liver training or rebound......