This isn't a serious situation but I'm not sure how to react! My friend and I discussed going on holiday together this summer. She offered to organise it. She has just messaged saying she has found somewhere and wants to talk to me about it as she has a short window to book (she's really busy). But, she asks if it is ok for another friend of hers to come with her daughter. I am a more the merrier type of person and sociable enough but I have never met the woman and also don't speak the same language as her. My friend says it is their only chance of a holiday this summer (other woman has recently divorced and is short of money and deserves a break).
I love my friend and she is coming to stay with me in April (lives in a different country) but honestly can take or leave the summer holiday and don't want to share it with someone I don't know plus a child I don't know. I would not be fed up in the slightest if I didn't go on the holiday. We are old friends and there will be another chance to holiday and I could do with saving the money as well. But we have discussed this holiday so often. I feel embarrassed about backing out and really don't want to say that the main reason is the other woman. What shall I say?