How to get an anxious, food-motivated cat in her carrier on a 12 hour fast!?

My 3-year old kitty of about 6 months is still very timid. She is extremely food-motivated. She can't be picked up and can barely be pet at times. Any tips on getting her into her carrier for a quick fasted blood test at the vet?

She won't go anywhere near it after weeks of having it out (unless food is involved). If I try to feed her inside of it before vet day, she will eventually give up and go in, but if I put an empty bowl or some catnip in there on vet day, she isn't interested at all. I tried the Cat Burrito a few times and she explodes like a firecracker, can't hold on to her. I tried grabbing her by her scruff (while supporting her body, of course) to pick her up but she doesn't seem to freeze up like a lot of cats do. I'm at a loss here. I can get her in the carrier just fine with food as bait, but without it, it seems hopeless. I can't keep traumatizing my cat every weekend if it's just going to be unsuccessful each time.