I've been in some form of contact with her for almost a decade, first as a coworker, then living with her, then as manager AND living together (that was weird), then just as manager. So not seeing her anymore will be very strange

Oh geez. That would be weird.

Our relationship isn't nearly as good as it used to be - at all - but she's been a constant and now she... won't be

2020 is already a very weird year

It really is

Likely not. Our relationship has been awkward and not really fun ever since she got moved to our store as manager, snd I suck at keeping in touch anyway