Okay! This morning she emailed me a weather forecast for the camping spot, and (sad for me as I'm canceling) the weather forecast was perfect. I couldn't stall responding any longer, since yesterday there was the text, an email asking if I'd gotten the text, and this one about the fabulous weather.
Because of this topic (thanks, people), I didn't do a white lie. I wrote, "Hey, sweetie, since it's your special thing to do with NameDeleted, I feel like I should bow out (I don't know her well enough to be comfortable doing that SpecificDeleted activity). It's not that long since I came back from Burning Man, also; I shouldn't push Husband's patience too much. I'll see you soon."
I appreciate the input. I think my friend is genuinely a "the more, the merrier" kind of person, and so if I were to suddenly invite someone to come along, she wouldn't mind it so much, and so she doesn't get it. She does know I'm fragile these days, but she also has the attitude (which she came out and said not long ago) that I have it easy and should buck up.
In this topic she comes off as a lousy friend, but she is a warm, wonderful person, really. We've been friends since the eighties... over twenty years.