This is why Flan got locked in her room, isn't it? Not because some claptrap about her not knowing her own strength, but because she pissed off the Head Maid.

Since it is Sakuya, I'm sure there would be a lot of volunteers to take her low-fat milk directly from the source. Eager volunteers even.

Wow... That's critical strike...

This is why Sakuya prefers Remilia. At least Remilia has some knowledge about this stuff.