This is part of life. Some times something embarrassing happens. But everybody forgets about it in the future.
Another thing is that 2 people like family members who have a close connection between them, there are connections between the two souls. This also can have the two minds influence each other, especially when there is some kind of emotional energy connected to the thoughts. This is commonly experienced as one person seeing a 2nd person's face in your mind when the 2nd person is thinking about you. Or picking up the phone right before a person sends you a message, because you felt the person focusing on you mentally and that told you to pick up the phone.
So the fastest way for her to forget that this ever happened is for you to make yourself forget that it happened, and force yourself to not think about it and not worry about it. If you start worrying about this, force yourself to think of something different instead. And just by you being careful and to have both of you forget about it, both of you will naturally forget about it.