Strictly conjecture but I would say Huma is very special to Hillary and not only from the standpoint of a working relationship. I'm not trying to infer some kind of lesbian type situation either but more of one of two people in common situations. Hillary is very aware of what it's like living with a cheating husband, so much so that many say they have a pre-arranged agreement, and when the episode with Huma's husband blew up and all over the news I'm sure Hillary played the roll of a loving mother and comforted Huma for being is a very familiar situation.
I'm sure that Huma Is as trusted a confidant that Hillary has and very likely, if she's elected, Hillary will make her Chief of Staff or give her just about any position that she (Huma) desires. As for Huma's religion I haven't heard or read anything regarding that but any Democrat these days seems to have the inability to say the words Radical Islam in the same sentence.