How to get difficult kitten into carrier

Hi friends, I’ve been fostering two kittens for around six weeks. Both needed some socialization when I picked them up and one, the boy, has made more progress and is now fully handleable and attention-seeking. The girl has also made a lot of progress however remains stubborn regarding physical touch. She will eat and play in very close proximity to me but when I try to pet her, she moves away.

They’re being adopted today, yay! I’m hoping to get her into the carrier with as little stress as possible. Any advice?

BTW, the rescue’s carrier has been out in the room, but they won’t be going home in that - the adopter is required to bring their own. Cat tax attached of slightly spicy friend