Can she be pickpocketed. She does stand and fight if you attack other guild members?

Who are you talking about? Most characters in the game can be pickpocketed, if not all of them.

If you're undetected, no-one will take any notice.

The face changer in the thieves guild? Just looking to see if i can pickpocket my money back from her. Anyone tried it?

I tried it once. the money doesn't get added to her inventory.

Oh, I beg your pardon. Forgot about her, haven't used her at all.

I'm pretty sure you can, I don't see why not? You'll need the necessary perk. I always pickpocket the money back from the Archery trainer in the Ratway. When I fail, he always forgives me.