Good morning Robin and Rosie and welcome to the Relaxed Lantus Family!!
First sorry I wasn't around to welcome you yesterday but I messed up my back and hip on Monday and was pretty loopy on pain meds yesterday.
Being a pen and paper kinda girl is just fine with me as I'm the same way. I'm horrible about keeping my own spreadsheets up to date.

The only problem with those type of records when working with an online forum is the others can't see what you're seeing. :lol:
So for us to help you to help Rosie we're going to need to figure out a way for us to see what you're seeing. The easiest is through the online spreadsheet, but I can also work with just getting the information through Rosie's daily condos. What I use to do is post daily in my condos then on the weekend when I had more time fill in the spreadsheet. Although now after 3 years and 4 sugarcats (3 that are still with me) I seldom update my spreadsheets. Dancing with a sugarcat I have down now lol.
Some quick questions that will help me fill in the blanks. And help us get caught up to date on you and Rosie.
When was Rosie started on Lantus?
Is it the first insulin she's been on?
How old is the pen/vial? (since you have a note about it being weakened)
What are you feeding her and how often?
Is she your only fur kid?
Then anything else you want to tell us about yourself or her to help us get to know you both.
Like here I have 16 cats 3 of which are sugarcats, another one is deaf, one is epileptic, an two others are cardiac kitties. The rest are just spoiled rotten. I also have a 97lb drooler who thinks he's a clumsy kitty. lol But with my zoo I can't easily do some of the tricks that others can like playing with food brands or feeding times because I have lots of tummies I have to take into account. And all the cats have to agree on the menu. Things like number of animals and things like your health (I can't test a lot at night because of my evening meds) other family commitments and job all play a part in what is the safest way to manage Rosie's diabetes and keeping you both healthy and happy.
So once again welcome to the family and I'm looking forward to getting to know you both.
Mel and The Fur Gang