Does a Mistress get anything from torturing?

I got Dungeon Keeper 2 on GOG a while ago and have been playing it recently. Any enemy hero creatures I capture I try and convert to my side by torturing them, and every so often the Mistress comes in and seems to torture them too.
So does the Mistress gain XP towards her level with this? Or is it just an animation thing? I keep removing them from the room on the off chance they actually kill the creature before it's converted.
Also, when the Mistress uses the torture chamber herself does she get anything from using the devices? Or is it just like a Casino and it is 'her' way of 'having fun' when not fighting?
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Ruyi's method of punishing Wei Yanwan is not vicious but torturing! #RuyisRoyalLoveinthePalace
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