Hi Heidi, sorry I didn't see your post last night. Has Heidi eaten anything since your last post? You definitely want to give her the increased dose. If there are any ketones, you do not want to skip or give less insulin. Her numbers are pretty flat. I will tag @Bron and Sheba (GA) who has more experience with ketones and DKA.
I wonder if pancreatitis is also a possibility. You might want to ask the vet to test for that.
Do you have any ondansetron? Does Millie look nauseous?