My boyfriend's mom saw us when he was spanking me, How should I face her now?

We were enjoying yourself at my boyfriend's house in his room and suddenly he decided that I should be spanked because I have been a bad girl lol. And in excitement we forgot to close door. After few minutes his mom walked in because she wanted to take something and as she opened the door she saw us, me lying on his lap and he spanking me. She didn't said anything just left the room immediately. I left for my home from embarrassment. I don't know how to face her now, I am afraid she will think that I am girl with no self respect or something. I hope she understands it was just for fun and we both are vanilla couple.
My boyfriend's mom saw us when he was spanking me, How should I face her now?
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