#22 - April 16, 2018, 6:48 p.m.
I think the suggestions here are good - personally, I'd recommend trying to find a guild on your server that's welcoming to new players. Depending on your server, there's likely a few for both factions, but start by asking around in Trade Chat or checking the Guild Finder
That's probably a good starting point, as I'm sure you can get folks from a friendly guild to run dungeons and such with you guys, with the understanding that she's learning the books still.
Maybe you had an unfortunate encounter, but I would also recommend just giving it another go - there's tons of guides online, as well as the dungeon journal in game, which can also help ease any dungeon learning curve.
From my time spent in dungeons, letting the group know that you're new or haven't done a particular dungeon ahead of time has almost always gone over fine. It really depends on how you're going about this; a quick "Hey guys, first time here, let me know if I need to know anything!" normally goes well.
A question to you - what class is she playing, and what role? If she's taking the mantle of tank or healer, she may have a harder time earning that "new-player acceptance" when playing a role that is more necessary to lead the group through the dungeon experience.
Edit: You could also go the route of not telling people, as others suggested, and see how that goes. :)