I don't think Bungie would bother retconning her into an Arcstrider. Plus her ability to "dance with lightning" is an obvious reference to Arc Blade, which is Bladedancer's super ability. Fun fact, Eris Morn was a Bladedancer until she lost her connection with the light; make of that what you will. Shiro-4 is likely also a Bladedancer judging from his role as the behind-the-scenes parallel to Cayde-6. Bladedancers are still canon in D2's lore, as are Sunsingers and Defenders. I'd love to see those subclasses return someday; getting to use those lost abilities again in D2's sandbox would be such a treat.