How do I tell friend I don’t want to travel with her?

You say you’ve sharing your thoughts on travelling……….so, does that mean you haven’t booked anything as yet? That being the case, simply stop talking about it, make your own plans and discuss with no one! Go and enjoy the trip by yourself…..no one to consider, no one to answer to, no one to look after.
Also, it might turn out that the friends health problems make travel insurance too costly.

love GN??????

long is what I typed…….

Tell her you have chronic sleep issues, and that on second thoughts you would much rather sleep on your own in your own room.
It’s hard enough sharing a room with a good friend, never mind someone you hardly know.

If it is organised group travel then you can’t really stop her booking a place, but Id stick with a single room. Even when I travelled with my sister we had single rooms! And say you’re going in a group because you’ll both want to mix with lots of new people and all go around together. And do just that!

If you were planning to go it alone you can just be pleasant and say actually this is my solo adventure., something I’ve always wanted to do.

Or you could go into in detail, making it sound as demanding and uncomfortable as possible. With an itinerary that includes lots of climbing, love GN days, cheap local stayovers and live st of on and off public transport, humping your luggage with you.
😬

Are you planning on going as part of a bigger group?

Three weeks is a long time to travel with someone you ‘don’t know that well, and with health issues’.

Have you encouraged her when she suggests going with you, but now having second thoughts?

If you are ok with being on your own, I would pay the extra for single and stick to original plan.

Might be awkward if she is still up for it. 🤷‍♀️

Well you say close friends then say you don’t know her that well? Is she a new member of your group ?
I think it’s a huge dilemma as the company could be good, or awful and everything in between
What’s the alternative …going alone ? Are you happy travelling alone have you done long distance before on your own it can be a bit daunting and lonely, but going with someone you might end up not liking much would be worse
My mantra would be if you’re not sure stay as you planned originally