Memoru in the Pointed Hat: Marielle's Jewelbox(1985)

とんがり帽子のメモル マリエルの宝石箱

Marielle is a young girl currently living in a remote house deep in the mountains between Switzerland and France to recover her health. The story is told through the memories of her adventures with Memoru, a tiny alien girl who lives on a nearby island. Her people are gnome-like beings who are stuck on Earth after their spaceship crashed here.