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It's very, very unlikely that the difference in calcium concentration is causing these issues. Yes, in higher doses calcium can cause constipation, but it takes a lot more than what you can find in drinking water. Also, magnesium usually has the oppossite effect and if you have a lot of calcium in your water, you tend to also have a lot of magnesium.
When you move from one country to another, a million things change. One of them may be the composition of the drinking water, but as /u/YouWillNeverGetThiss already stated, it also changes from one region to another within the same country. There are so many other factors that are much, much more likely to cause the issues:
Diet. It's almost impossible to find exactly the same food in two countries on different continents. She is forced to change her diet, which can cause issues like these. Usually, they will go away after a while, when her body adapts to the new diet.
Stress due to a change in environment and habits. This is really unavoidable if you move to a completely different country. It can be a positive experience, but it will always still be stressful and constipation is a very common reaction to stress.
Drinking less. Especially if you think the water is causing her constipation, she may (subconsciously) start drinking less, which can cause constipation as well.
One thing she can try is psyllium seed husks (Flohsamenschalen in German). You can find them at most drugstores or order them online. What I do is fill a big glass with water and a little juice for taste, then add a few tablespoons of the psyllium and stir. The husks will start swelling and swim in it like little jelly-beads. If the water turns too thick to drink, you have used too many husks or too little water. It's very important to use enough water with it, or it can actually cause constipation.