It's hard at that age, as they generally can't reason well and haven't a clue what's wrong themselves.
some suggestions - learn some signing to help her communicate; give her something to eat (hunger is always a big trigger for my DS).
I hope she's feeling better soon.

They're all a bit different too. My DS had emotional meltdowns from around 10 months - usually triggered by tiredness, discomfort or, most commonly, hunger. It wasn't till he was 3 that he actually started having proper tanties.