Epiphyllum Wendy

I was surprised to find out the name of this pink flower...
After TaiChi at the usual place, we went to our friend's house and she was very happy to see that one of her flowers had bloomed. We took pictures and talked about how delicate and exotic these flowers are and how short their time is to adorn our garden. I am not sure she knows that the name of the flower is also her name! I think she'll like that :-)