I have this doubt around grinding my gears... Whenever if I capture an enemy Queen... It automatically becomes a Princess specialist or it just remains as a captured non-participant unit?if that's so... Vanilla uses hypnotist to change it to my side? Thnxforyour answers

A captured Queen stays as captured Queen. If she falls under the spell of a your Hypnotist, she becomes a Princess, subordinate to your Queen in her adopting kingdom.

The new Princess's only hope is to be promoted to the Queen of your empire as her conqueror falls in battle.