As much as you want to see your sister, it's not worth getting stressed over because you won't enjoy it.

Couldn't you go to visit but stay in a hotel from the start, that way if your sister does get too much, you'll be able to get away?

If she wants to know why (not that you have to give an explanation), just say that you think it would be easier for both of you to have your own space.

I hope you find a solution that works for you.

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