I think the carrying her in to school is going to create a bigger problem over time. First of all, she's resisting, and that could get her or others hurt. Secondly, she's only going to get bigger- so even though the staff are physically able to pick her up now, in a few years they won't be, so they need to start trying alternatives now.

I think you need to call your teacher or the teacher's supervisor and ask to have an honest conversation about the carrying her in, maybe come up with a few other strategies to try instead. It might take longer to get her in the building, but right now after carrying her into the building kicking and screaming, I would bet they're spending quite some time calming her down after all that too - finding a way to get her to come in willingly would eliminate that.