I can kinda understand the VSC dating because for a while it was 24 hours but the standard was changed to 48 hours for a long time now. For the rest of the behavior it sounds like she’s used to the way her store is run (lax) and because she wasn’t planted in a specific role, felt she could do whatever as a floater. No excuses for the till sharing though, even a floater should have their own register opposite the main reg person in case you need two people to ring.

You said she’s just transferred so I’m sure she was also trying to figure out where everything is. Where she was wrong is not communicating with you and trying to do things at the expense of partners and customers. And also, not learning the rhythm of how things are run first. Based on what I read I don’t think she’s targeting you but it’s definitely not cool she blew you off and then accidentally injured you. I think she may be thoughtless, or inconsiderate, but not malicious — I don’t think she’s using your till to piss you off, more like she can’t be bothered to open her own. All still definitely cool, though. Have you tried talking to her about it, or maybe a supervisor/manager to mediate?