I am pretty new to the game (played for a month a few years ago), and can confirm she is a really easy solo for 5 wizard. Not twinked (obviously). No buffs except the Gloomingdeep Guard buff you get from the spells guy (Rytan?) in the revolt camp, and the level 1 Minor Shielding Buff.
Easy to pull with no adds, ended w/ 40% HP and 22% Mana, just cast Blast of Cold over and over. Should not need a group at all, I assume this could be done almost as easily with a 4 wizard, and less HP left over.
Every character should be able to kill her at lvl 7 solo. My shammy who wasnt twinked and only self buffed was easily able to kill her. She only tries to poison me with Gloom Poison and dont hit me very often.
Killed a few times with both my necro and bard, was easy, hits about 11 max and can poison, but easy. drops no good stuff, only what other spiders would drop. Dont forget the chest behind her