Good morning and welcome. First I want to say that you are not going to harm Gabby by educating yourself and learning to keep her safe. The information and help is here. I suggest you create a signature so that members have information on Gabby, to make better recommendations. This is the link on how to do that:
http://www.felinediabetes.com/FDMB/threads/editing-your-signature-profile-and-preferences.130340/
Are you home testing? This is your best defense against harming Gabby with giving insulin, and hopefully getting her into remission. Hypoglycemic events are NOT to be expected, and are preventable. Many members work full time and successfully care for their diabetic cats. Please create your signature and then post your questions and concerns in the Main Forum, where there are more eyes to see and you can begin taking care of Gabby better. Link to the Main Forum here:
http://www.felinediabetes.com/FDMB/forums/feline-health-the-main-forum.28/
When you can, take the time to start learning more about Feline Diabetes , it may not all make sense or sink in at first, but keep reading and rereading. There is excellent information on the Home Page, and here is a link to a resource here in the forum area.
http://www.felinediabetes.com/FDMB/forums/health-links-faqs-about-feline-diabetes.14/
Click on the yellow tag: Index, and scroll down for a list of information.
I know this seems like a lot, but my concerns are that you are adjusting insulin dosage and have had two hypoglycemic events, this is dangerous to Gabby and you can prevent that. We are here to help.