My cat hates her carrier

My cat hates her carrier. Whenever I try to put her in, she runs and tries to hide somewhere. I've missed vet appointments because I can't get her in the box. I'm trying to take her to a friend who's going to watch her over the holidays, and I can't grab her. We have a wonderful relationship otherwise. I've tried treats and the laser pointer. This has been an issue since I adopted her seven years ago, but it's getting worse. It's maddening. Any advice?