Client accidentally accessing Zoom annotation tool

I work remotely with a Client who appears to be accidentally accessing the Zoom annotation tool during our coaching calls. First it was a crosshairs icon (that I'm not familiar with - it isn't the same crosshairs used to capture a screen grab > see photo attached), then it was definitely the eraser function from the Zoom annotation bar.

**please note in the attached photos that you can see *my* annotation tool on the lefthand side of the screen because I'm working with her

I have checked/tried:

• esc key - doesn't work
• command+Q - doesn't work
• force quit application - doesn't work because you can't click on it
• force reboot - does work with manual button
• checked hot keys and hot corners settings
• checked updates for Zoom
• general inspection for dust/debris
• the Genius Bar has run diagnostics on her keyboard

A friend mentioned she might have a wireless keyboard somewhere on her desk under papers and that it's been accidentally activated. I plan to check with her on that as well.

Any other thoughts?