One of my cats gets very anxious whenever she is in a crate/carrier, especially on car rides. For context, she is a 5 year old, and I have been trying to work with her on this since I got her at \~8 weeks, but with no real success, both through training/exposure methods and (exclusively vet-prescribed) pharmaceutical methods. Between vet visits and traveling, she has to be on a car ride probably about a half dozen times a year, so this isn't a constant issue, but still a concern.
When she gets anxious, she claws at the carrier she is in incessantly. (She also pants, drools, meows a lot, etc., but that's not what I am asking about in this post.) In the past, she has torn holes in a couple soft carriers, so she now has the Petmate hard carrier (https://www.chewy.com/dp/53619). While this does stop her from being able to break out, I have noticed recently that, after a long car ride, she sometimes has scabs on her front paws where she tore the skin off scratching and the holes in the sides of the carrier. These injuries have never been serious enough to bleed noticeably or anything, but of course I'm sure it is painful for her, and I'm concerned about infection risk with any wound on a cat. For what it's worth, while she scratches at both the metal bars at the front and the holes in the plastic on the sides, I am pretty sure that the plastic holes are what are causing the injuries, since the metal bars are very smooth.
Does anyone have any suggestions for a cat carrier that is hard to prevent her from clawing her way out while not putting her at risk of hurting herself? I have been unable to find anything suitable in my searching so far. Alternatively/additionally, does anyone have any suggestions for modifications to a carrier or different training or strategies to help with her anxiety? I have tried many things and talked to a few vets, but I am always open to more suggestions.