So you free feed essentially.
I guess you can see how that goes.
Manipulating her curve with food can be very effective at flattening them out, bear it in mind should you find she just doesn't flatten out it would be something you could try.
I take it you take up the food 2 hours before she amps/pmps?
Also bear in mind that if Ruby decides to eat in the latter half of the cycle, (after +6) she can make her numbers spike before the next shot, in an ideal world we want to avoid that, because lantus works better if you are shooting a lower number. George's mini meals were usually just a couple of teaspoons (1 ounce) approximately amps/pmps was 3ounces. (plus anything extra he had to have to save him from the sharks)
I changes what I did after reading this post amongst others
https://www.felinediabetes.com/FDMB/threads/8-10-tashie-pmps-high-questions.101989/#post-1087990
Even if you aren't able to implement a feeding schedule with her, the above post is really informative with regards to what action you can take when you want to manipulate her numbers, to either flatten her, or if you need to go out and keep her safe.