Do you think it's wrong for a married woman to have a crush on someone, like a coworker?

It is not necessarily wrong if you can do it secretly and nobody else is affected by it. It would have to be very carefully planned. Also, is the affair going to be a one time sexual encounter or a long term affair. Is the affair going to be just physical without either person falling in love with the other person. So once it has been carefully planned, enjoy it. 😜