I agree with Jessica. Miss Kitty could be coming down lower at night and then having these long bounces. She did well on the 1.75u before but that may not mean alot now. However, if you keep increasing without having the full picture, you could get into an overdose. Quite often on an overdose, the numbers will be high until she hits a breakthrough...too much insulin can look like too little insulin.
Glad you can do the curve and see what's going on.