Hi, Amber.
When did you start Mookie on Lantus? I know I would find it helpful if we knew a bit more about your kitty. How long has Mookie been diabetic? What food are you giving your cat? Are there any other health issues going on?
If you've not already done so, you might want to look over the sticky notes at the top of the board. In particular, you might want to decide on which approach to dosing you want to use -- Start Low Go Slow (SLGS) or Tight Regulation (TR).
At the moment, it looks like Mookie isn't getting enough insulin. If you've just started using Lantus, it takes approximately a week for the insulin depot to form. Until the depot has stabilized, you might not see much movement in numbers. In addition, we typically change doses in 0.25u amounts.