I don't see were 87 octane would be a problem. Unless of course you plan to drive the car.
cool weather and some 93 octane in the tank already, you might have gotten by OK. Also note that the sign on the pump says "minimum" octane. The tank could have been holding higher the day she filled it.
Finally, I have to ask, You really trust a woman's judgment when it comes to your car?

Are you sure it is a good idea to let her be right on this? I mean it's a guy thing to be right, stubbornly so, especially about cars and machinery. Even when we are wrong. It's like a law of nature or something
What's wrong with you?
roadster with a stick.
I know I know, sexist remark. Now it's my turn to get the burn.