I didn't really do anything in specific...I think.

[ the water seems to have boiled the time hinata said, more or less, so nanami...

...

stares at the stove trying to figure out how to unlight it. help. ]

Staying calm about it probably helped her to stay calm, though...however, I think her personality is a pretty calm one...maybe. Although a few times...she did get into places she shouldn't have gotten into...