as Jack stated above.....
Under the "Rules For Visa Merchants" guide (it's online, you can download it) using 'See ID' is not acceptable. Here's the section....
“See ID”
Some customers write “See ID” or “Ask for ID” in the signature panel, thinking
that this is a deterrent against fraud or forgery; that is, if their signature is not
on the card, a fraudster will not be able to forge it. In reality, criminals don’t take
the time to practice signatures: they use cards as quickly as possible after a
theft and prior to the accounts being blocked. They are actually counting on you
not to look at the back of the card and compare signatures—they may even have
access to counterfeit identification with a signature in their own handwriting.
“See ID” or “Ask for ID” is not a valid substitute for a signature. The customer
must sign the card in your presence, as stated above.
So she was just following the rules.