hi sarah!
i see that you just switched over to lantus 2 weeks ago. you're going to have to learn how to "do" insulin a different way from Humulin. Lantus is a slower acting insulin and the effects linger longer than Humulin. Its actions are significantly different in the cat's body as well.
We do a minimum of 3 tests per cycle with lantus - the preshot numbers are so we know it's safe to give insulin. the midcycle numbers tell us how the insulin is really working on baby's body. really all of the dosing decisions are based upon the low point (nadir) in the cycle. different cats nadir at different times, and even the same cat might have the nadir slide around, but in general, the nadir is somewhere around +5-+7.
So with Humulin, my understanding is you shoot based upon the preshot number - you have to mentally switch to basing your dose now upon the mid-cycle number, making those tests very critical. does that make sense?
also, for people who don't have a lot of data, we recommend you not shoot under 150 or 200, depending on your comfort zone, how much data you have on how your cat responds to lantus, and whether or not you've got strips and high carb food and are going to be home to monitor your kitty. Here's the information on shooting & handling low numbers:
http://felinediabetes.com/FDMB/viewtopic.php?f=9&t=147
here are some other essential posts for you to help you learn how to use lantus. This is the Lantus Support Group main page - the starred stickies at the top of the section will be really helpful to you. Start with the "New to Lantus/Levemir" and go from there!
One more point - because of Lantus' gentler action, the obvious signs of hypoglycemia are sometimes not present until a cat falls into the critical range. my own cat has been at 32 with zero signs of hypo. the only way you know is by testing. Also, Lantus requires consistency - every skipped shot or changed dose causes "wonky" numbers that can take up to 3 days to settle down. we try to stay pretty close to that 12hr/12hr shots to help the Lantus work best.
i'm concerned that you shot a 97 and aren't getting mid-cycle tests. Baby could be going critically low mid-cycle and bouncing high by the preshot time - that does happen! so please get some tests in their mid-cycle and come on over to the Lantus Support Group so we can help you help Baby! We can also teach your mom, or be a resource for her, so that she understands how it all works.
edited to fix my error re: humulin insulin.