Is it normal gf mad at me when ‘mad at everything’?

my girlfriend sometimes is ‘mad at everything’. she never specifies whether or not it includes me, but sometimes i feel it does.
when this happens for others, is it normal?
i try not to upset her, i haven’t been very angry with her yet in our relationship (less than 6 months tgt) but when i do have some criticism for her, i am careful to articulate myself well and make sure she knows i’m not trying to make her feel bad.
I’m nowhere as quick to anger as she is, so i’m asking is this normal?