[quote=@Lugubrious]
What Master Hand does and doesn't do is governed by strict plans and rules. It is not the type for meaningless pranks. If anyone was just stuck on the mountain alone in the elements without gear or preparation the cold would almost certainly claim them. There are a lot more people that could use her love in Al Mamoon, or even Lumbridge, for instance.

However, there was one possibility I left open. The building that Midna spotted: the Convent of Our Lady of the Charred Visage. It's essentially an abbey whose sisters worship a woman whose face was used as a likeness for divinity, but who burned her face with boiling oil as an act of piety to distance herself from such comparisons. Those who reside there, half-frozen by the cold and half-burned by the scorching lava that flows within, are extremely hostile, but since Flonne is an angel it's possible that they see her as a divine benefactor come to ease their pain. She may have come this way after hearing about it while in Tostarena or Al Mamoon, wanting to provide what comfort she could to a place suffused by suffering.
[/quote]

The second suggestion is actually one I can get behind. That definitely sounds like somewhere she would try to go.