I’m sure Zoom may see this on their end, but the teacher, parent, and school all see her trying to use the correct password AFTER she surreptitiously logs off and uses the incorrect password a few times.
All the adults in the room can tell Zoom is that there must be a glitch as the child logs on successfully before Zoom kicked her off. They SEE her using what is the correct password.
Having been a teacher in CA, I know that they have few tech resources for entire school districts. My high school shared tech support with two other high schools of roughly 2,700 students for each school. My guess is that they sent out another teacher who had familiarity with technology, but who wasn’t the actual school tech support. If the mother’s friend hadn’t caught her logging off Zoom, the district may have eventually figured it out once they got adequate tech support for her.