This doesn’t sound like Epson. It sounds more like a scammer. You should check the machine over to make sure that they didn’t install more than that. Such as remote access software for example.

I'm going to delete, it was not Epson.

She got some other company.  they put a new firewall, looking how to remove.l

No.

Mouse can act strange if desktop is dirty.

( Or, they took control. )

Did anyone other than her control the computer mouse by chance?

Warning: EPSON Official Support : Installed 3rd party FireWall ( Apple has a FireWall ), and UNINSTALLED CleanMyMac( has Anti-Virus Protection ), to "fix" a driver issue with 14.1.2, MacBook Pro M3.

Did my mother just get a TROJAN install on a Pristine Machine?

Warning: Epson Support Installed a 3rd Party Firewall and Removed CleanMyMac!