I just wanted to post an update.
I sent her an email. It was a very nice email saying that I'm excited that she wants to visit, but also have been stressed and unfortunately have such a small house (true!). I basically said, "what do you think about staying with friends or in a hotel?" - and that would help me, and let me focus on enjoying spending time with her while she's here.
At my T's suggestion, I suggested that if she did this, we could have dinner Friday night and then go do something fun Saturday, and that she could spend Sunday with her friends (she has tons of local friends that she likes to catch up with).
Once I sent this... I actually felt really GOOD about it. I realized that even though I'm not close and lovey with my mom, I could enjoy her company (in limited quantity!) and really what causes me the crazy-stress is having her staying in my small house, and having to interact with her for 72+ hours straight with no escape

So I felt happy and thought my email was very nicely worded.
Well... it's been almost 24 hours, and no response.

She usually responds to emails within a couple of hours (she has an ipad and is always connecting with friends, very social).
I know that means that she's unhappy... she's done that before, just refused to acknowledge a message. So, I'm feeling a little bummed out by that. I really want her to reply, so I can plan appropriately and not have this "worry" hanging over my head.
Anyway, I wanted to share... I was surprised at how much better I felt about the visit with the idea of her staying somewhere else, and just getting together for dinner and some activities the next day. I can totally handle that. I just wish she'd reply!

Thanks!