everyone gets stressed every now and then everyone gets pissed
off every now and then, and sometimes people don't actually want to
feel instantly better as surprising as that might be... let whine
about whatevers bothering her and don't just smile and nod, and if
she just needs you to be with her while she's pissed off until she
feels better then do that.. just don't leave her on her own. if you
know her well enough i guess even if you don't think you know what
you're doing 90% of the time you'll know what you have to do, the
other 10% you're the problem :P