The girl is called Mariel, not Muriel; and the anime is not specifically set in Switzerland, it just has a generic European setting.
Anime requests
Tongari Boushi no Memole (TV Series, 50 episodes, AniDB)
Requested on Sept. 26, 2021, 6:46 p.m.
A sickly young Swiss girl named Muriel discovers that little people live out in the woods. One of these little folk, Wendy, befriends her - soon, buoyed by the mysterious healing power of Wendy`s people, Muriel is following Wendy back out to the woods to have adventures. Source: ANN Note: A compilation movie based on several of the episodes has been released in the United States as "Wee Wendy".
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My heart would be so happy if this was your next project!
No need to bother Old Castle:
https://9anime.id/watch/tongari-boushi-no-memole.opjy/ep-1