I have modified a way used by a Dk and a hunter to solo Bloodqueen lanathel. If you have access to the terracotta fragment or a ghost Iron dragonling trinket, casting shadowmeld (nelf druid) right before she bites causes her to try and bite your "pet" instead of you. I have not gotten this to work with the treants we summon. For the rest of the fight, bloodqueen doesnt bite you again, giving you until her enrage to kill her. This is a significantly lower dps requirement. I have not checked whether invisibility potion could be used instead of shadowmeld. When using the dragonling, timing is everything as the dragonling has very little health. You need to re-engage the queen very quickly to avoid resetting the fight.