Hey there and Welcome to the best place you never wanted to be. I understand how overwhelming this is to you as it was to all of us when our cats got the DX of feline diabetes. You certainly have you hands full with your schedule but managing her diabetes can be done with some good scheduling on your part.
Do you know what her Blood Glucose (BG) was at diagnosis and what insulin she will be on?
Food is very important. We recommend a low carb WET diet under 10% carbs. I will link to you a chart that we use. The crbs are the third column form the left. Many use Fancy Feast, 9 Lives, Friskies, etc. This list can also be found inwww.catinfo.org If you are already giving insulin and you have not transitioned to wet, low carb cat food, be sure to test while you are transitioning. This is because by changing to low carb food, it could decrease your kitty’s number by 100 points or more by changing to low carb food, it could decrease your kitty’s number by 100 points or more. This chart is for the US, let us know if you are not in the states and we will provide you with the proper food chart link.
foodchart
Being concerned about overdosing her is a valid concern and we all home test our cats so we know what their BG's are before injection. Also, whenever you can get some more test in between the 12 hour cycle would be helpful. For a new diabetic, you do not want to shoot 200 or under. It is better for her to be too high for a day than too low for a minute.
Here are a couple of videos that will show you how to home test.
http://s106.photobucket.com/user/chupie_2006/media/testingear/sweetspot.jpg.html
Here is another good link on Home Testing:
http://www.felinediabetes.com/bg-home-test.htm
Meters: There are many meters. There is a pet meter called the Alpha Trak2 and human meters. Some use the pet meter because it is what the vets use so the numbers will match up. The meter and strips are expensive though. Most use human meters that can be purchased at any pharmacy. It typically reads a little lower than the pet meter but we have ways of compensating it. Many use Walmart's brand, Relion Micro or Relion Prime, because it only needs a tiny drop of blood. The Prime testing strips are ½ the price of the Micro.
Lancets: These are used to poke the ear to get blood. There are many different sizes (gauges). It is recommended when you are first starting out to use a 26-28 gauge. Also, it would be a good idea to pick up Neosporin WITH pain reliever to apply on the edge of the ears and don't forget to alternate ears.
Hypo Kit: Always good to be prepared for possible hypo events which means that your cat has reached dangerously low numbers. It can be fatal, hence, the importance of home testing and collecting data in a spreadsheet. In each of the Insulin Forums are stickie’s labeled Hypo Links. Please print and post on your refrigerator so everyone in your household is aware of hypo symptoms. You will want to create your hypo kit that would include and not limited to; extra testing strips, honey/karo/maple syrup, high carb food, medium carb food, vet information, etc
This is a lot of information for now. Please let us know if you need any question answered , we are here to help.