Yes, you can use the paw pad...our one concern about that is the chance of picking up something from the litter box, but if it's easier to do, it's more important that you get those tests...you can put some neosporin ointment on her paw pad after you're done (but be watchful for any signs of infection)
As for feeding, there's no reason you can't leave it down and let her graze. Actually several small meals are better for most of our sugarcats so their BG is more stable. Figure out how much she should be eating and put down 1/4 to 1/6 of the total amount down 4 -6 times/day...she'll get used to eating while it's down, and you just have to steel your heart against those "looks" our cats are so good at...the ones that say "Hey mom, I'm starving here..don't you love me anymore??"
She's probably eating a lot more now because she's not controlled. Once you get the diabetes under better control, she'll probably need a lot less food. Diabetic kittys can't get the nutrition out of their food, so they eat a LOT more of it to try to compensate. If you'll tell us how much she weighs, we can help you figure out how much she should be eating too
Just make sure you take the food up 2 hours prior to shot times. You want to be able to test her before shots without having the number influenced by food. She WILL get used to scheduled feeding times, no matter what she tries to tell you....lol
A lot of us use chicken as our "testing treats"....catch it when it's on sale, boil one piece and freeze the rest. Chop it up and use it for her "reward" for getting tested...even if you're NOT successful! If you get her used to having her ears touched and rubbed, and she gets a reward for letting you do that, you should be able to move forward into poking. If you try 3 times and aren't successful, reward anyway, and try again later.
If you've gotten the Relion meter, you'll safe a lot of money on test strips. And the Friskies pate's and Fancy Feast Classics are both good choices for low carb foods. It really doesn't have to break the bank to give Penny the best chance at getting regulated...or even off the juice completely!!
How much Lantus are you giving Penny? How often? Lantus needs to be dosed every 12 hours and if you let us help you, we can give you all kinds of tips as well as help you with dosing to keep Penny safe as well as getting her under better control.
Don't get discouraged! Many of us know how it is to be on a tight budget and not have real cooperative kitties, but with practice and support, we know you can be successful!!