Something is not actually clear from your question sorry to say, are confirming that she attended or she just didn't say no. She might not say no just because she don't want their conversation tto extend beyond that or she might keep mute and not attend.
But whoever one, a married woman must learn to keep her calm and respect the oath of bond. Though, the world is a bit complicated now, some person are married physically but a widow psychologically, many couples don't have peace and very economical with intimacy between the two.
So, it is not right for her not to decline she needs to let the man know such things won't happen because she's married. And if the man persist and refuses to desist. Then she need to take further steps to make sure to avoid him. Such a date is not always with hidden agenda but the past is just a lesson.
And if she is interested, then the case is simple andc4