Sorry, I thought I had a link to this site and try to get to it every few days but have been quite lax these last few weeks. I've 'talked' to you on FMBD- which I do go to every day.
As an unregulated diabetic she is litteraly starving- so let her eat all she wants. I know Sneakers was up to 18-20 oz per day and there are some who went above that- 24-28oz per day. And if GF also has acro the tumor could be spiking her hunger as it is sending out the "GROW" message- think like a teenager- always eating
I thought that a cat with Acro would live only a short time unless you were able to do gamma knife radiation but recently found out that Cody has been an acro cat for over 6 years

so I have hope for my girl. There is no way I could do that to Sneakers as she panics on the way to the vet so a 2+ day trip would absolutely terrifying for her, plus the week of anesthesia needed for the SRT- at 17 she's a little too old for all that. GF is only 12 so it would be easier for her.
Cost- varies, but around $4000-$5000- depending on if you get some tests done at your home vet rather than at the hospital where the SRT is done. Lu did that for Grayson I do believe. Then you need to add travel for you both and hotel. This, too, I have to be honest in that I cannot afford to do it.
I would get rid of the dry food and replace the 'candy' with actual canned food that is higher in protein and nutrients. Once that is done you will have a better look at her levels. I say this b/c Sneakers would shoot up with the least little bit of kibble and GF is getting 1/8 a day. If that is all day rather than at one time (like on top of her food to get her to eat it

)
As for DKA- the 3 main things to look for is 1-
not eating (doesn't look like that is a problem if she is hungry all the time); 2-
lack of insulin (you are on lev and humulin R at high doses so that might not be a problem at this time); and 3-
infection. Get some ketosticks to check for ketones to help keep an eye on this.