I dont know why this is even an issue, multiple guilds pulled vox out of her lair (through the back, or the front), their were multiple guilds that fought her in the lair as well, /shrug. It's also amazing people are trying to explain out logistics of what a mob can and can't fit through on everquest, whether it be p99 or eqlive mobs could always do things that would make you look twice.
http://www.kupka.net/eq/vox/vox5.html
http://www.kupka.net/eq/vox/vox6.html
http://www.kupka.net/eq/vox/vox7.html
took me about 4 minutes to find these, Im sure if I spent actual research time on it, could find a bunch more.
I guess the physical logistics of a dragon being able to have half her body through a solid object (in this case a wooden door) and her head phasing into solid rock is something that escaped those badass live developers as well.