Top loading carriers are the best!

When you know you have to take her to the vet, take the carrier out and put it somewhere with the doors open. Leave it so they have the chance to examine it, sleep in it, walk in and out of it. It'll definitely help them feel comfortable in and around it.

The day of the vet visit, leave only the side door open and spray catnip in it. Toss a couple of treats in it.

Hope this helps. Good luck. Oh, and I don't over vaccinate my cats either as they're all indoors. I have it done if and when they have a vet visit.

Now MY issue with Bartie is, he hids WAY under the bed when I approach him because he thinks he's getting medicated (I have to do it twice a day). One time he did it a half hour before his visit. Fortunately, they had a later appointment, to give me time to get him in the carrier.

Please let us know how you make out.