MIL wants be involved in the delivery

Hey All,

My MIL wants to be part of the delivery when baby arrives. She wants to be in the room along with my mom and husband. Without thinking about it, I said yes. After thinking about and understanding how intimate a delivery could be I am no longer comfortable with the idea of her right there with me as I deliver my baby. Have any of you ladies ever dealt with this? If so, how did you tell your MIL that you changed your mind?

P.S she was REALLY excited when I said yes. I had just gotten over my morning sickness and was in the baby moon stage.