What's wrong with this poor magdalenae?

[estación seca]

The yellowish area in the leaf picture makes me wonder about spider mites.

I saw a talk by Phyllis Prestia, who had been to Angraecum magdalenae habitat. I wrote it up here:

Desert Valley OS: Phyllis Prestia: Orchids of Madagascar

It is cold, damp, rainy or dewy and dripping, pretty much all the time, way up in the mountains. She said it wasn't much above 50 F / 10C in the daytime. Humidity was very high all the time. It grows in dense forest shade.