Welcome again Ari & Bella,
Like the others have said, if you can get Bella switched to an all wet food diet, you may find that is all she needs, if not then you will be able to share a lot of your supplies with her. She can use the same meter, test strips, syringes, and even a possiblity of the same insulin. Lots of kitties here are on Lantus. In fact that was what we started my Max on, but for him it just took a small amount of insulin and a diet change to get him into remission.
Plus you have the added advantage of being a diabetic yourself, so you are WAY ahead of most of us when we first got here.

Since we aren't going to have to get you over the fear of needles or blood testing. You already know how important it is to test before giving insulin.
You can start with some of the basics while waiting for the UTI to clear and to take her in for her tests to see if she really is a diabetic. First get her diet switched...Like Lori mentioned if you have a houseful you can switch everyone, as they will all be improved with the diet..I feed 11 so I can tell you that even my non-diabetics or civies as we call them have gotten a great benefit of us having a diabetic in the house. So even if Bella proves not to have diabetes the food change will do her a world of good. I have two kittens that I have never fed dry to and they are some of the prettiest cats you would ever want to see. Their coats shine like the sun and they are so soft they are like petting silk. Even my 3 seniors began to play like they were kittens again once we got everyone off the dry.
At first I was concerned about the cost of switching everyone, but between the lack of trips to the vet, and the improvement in everyone's over all health it was well worth it, and it only really added about $15/month to our animal's food bill.
The other thing you can work on while waiting so if she does prove to be a diabetic is start getting her use to having her ears played with, and you can even take your lancet device, without a lancet in it, and start clicking it near her ears so she gets use to the sound of it. That is usually the worst part of the whole experience for a kitty.
Keep us posted and if you have questions just ask, we have years and years of experience dealing with kitties with all kinds of health problems.
Mel & Max