This is the 2162nd most frequent Portuguese word.
nela
"In her" or "in it" (feminine).
In this sentence, 'nela' refers to a female person being the object of trust.
Eu confio nela completamente.
I trust her completely.
Here, 'nela' refers to a location, specifically the page, indicating where the description is expected to be.
Há uma descrição detalhada na página, mas não consigo encontrá-la nela.
There is a detailed description on the page, but I cannot find it there.
In this context, 'nela' refers to a folder as the location for an action.