doh ! she could have left a cash tip on the table.
never mind
I always leave a cash tip......that way the server doesn’t have to report it. I waitressed......I made $2.00 for a 4 hour shift at lunch and my tips were the only thing that kept me going (this was back in the 70’s when I was a student).
I was just about to say that.
I need to have the receipt for my books but the tip is not deductible.
So I generally leave it in cash, it saves paperwork.
From now on I will write "cash tip" on the line to prevent this from happening to me.