First of all welcome and congratulations for testing at home that's a great start.
It takes a long time to get a cat regulated so is kind of normal that her numbers are not quite regular yet, but to really try and see what's going on, we would need to know all the results of the tests you are getting, are you testing mid day or only at shoot time?
There's a spreadsheet we use that will help you a lot and it will help others to help you, here's the link with the instructions (
http://felinediabetes.com/FDMB/thre...te-a-ss-and-link-it-in-your-signature.130337/)
Usually at shoot time they are going to be a bit high since the effect of the insulin is starting to wear off that's why we need some extra tests or a curve once a week depending on the protocol you choose to follow, I think you could take a look at the stickies in the Lantus forum there's a lot of information there that can help you. (
http://www.felinediabetes.com/FDMB/threads/the-basics-new-to-the-group-start-here.18139/)
How was the dose raised? because 2 units in a very short time since she started using insulin seems a bit high.
You don't have to do it, with the air that goes in when you get the needle into the vial (even if you are super careful just a tiny move will let some air in) should be enough to avoid getting a void inside the vial and having trouble getting the insulin out
If you do not refrigerate it then it would only last 28 days and it could be a waste of a lot of insulin, but Lantus can actually be kept out of the fridge, but if you do refrigerate it then as they mentioned it would last a long time without any problem