I actually had the pleasure of creating and leveling a toon to some extent with her once upon a time.
It saddened me quite a bit, earlier today, to find out that she has left RoM.
I encountered Xerise precisely once, over a year ago, with my old guild on Osha (Redrum). I was playing a lowly (!) 50/50 M/P and watched her HoT a Knight that was beating on one of our gates--we couldn't take him down at all. I went outside, attacked her, and she deftly switched back and forth, healing the Knight and herself, without breaking a sweat or missing a beat. Awesome performance, IMO.
Back on-topic. I've been leveling an M/D (recently hit 55/55) and with its currently-limited dirty-statted gear, I manage to stay alive about 95% of the time when my guild runs me through HoS/ZS/DL. Have to do that on the Druid side, of course. (That toon averages 10.5K-11K HP right now.) I've found the combo to be excellent for questing and soloing.
Our guild has a couple of higher-level (endgame or near-endgame) Druids, and they fare pretty well in Siege and RT/KT/GC. Note that in Siege, they get targeted pretty quickly, as do most healers.
If you do decide to come back to the game, please consider visiting beautiful Osha.