Well, I suspect Rachel *could* put off learning the new software and apps, and loading information into the systems. There are certainly some of her colleagues who will.
And those will be the teachers running around helpless the first week of school, asking all the teachers who did spend the time learning the new tech for help and generally making life miserable for the rest of the staff. There will be parents calling in because promised things aren't working, students upset because they are supposed to be using the new apps and they can't, etc., etc.
And if the teachers want good reviews at the end of the year, they'll put in the time now, while they have it, to learn the new tech. Once school starts and they have correcting and lesson plans, they won't have much time to learn the new stuff.
It's just that in most jobs, you get sent to seminars or have classes while you are at work, i.e. getting paid for your time, to learn this stuff. Teachers are expected to put in the time when they aren't working--at home during the school year, at home over the summer, to learn it.
Think of the assignments your kids have in school. Rachel has the summer to get all of them in shape to be put on-line, then get them all on-line. Is she getting paid for this time?
Yes, she can take time off when she wants to over the summer. But that doesn't mean her job doesn't make demands of her just because she isn't in the classroom.