I lived in Mozambique for two years and did not like the country at all. But I don't for a single moment regret the experience. Now, whatever else happens to me in life, I have lived in Southern Africa, so I have a bit of a connection and understanding that I would not otherwise have. To me, that far outweighs the inconvenience of spending a short time living in a place that one doesn't like.
We can't really judge by the experience of your German friend, as we don't know how long she was forced to live in China or why she didn't like it. But it doesn't sound like she was afraid of trying out new places - and that willingness to explore the world is commendable.