Girls, My girlfriend loves me but she is very moody. Sometimes she is so angry on me for petty reasons. What can I do?

Title says all. She regrets it whenever she gets upset and recently she said she hates that all we we've been doing is arguing recently but I know for a fact she definitely regrets it. What can I do to stop the arguing, make things better or just stop pissing her off?

We're honestly great together but she just gets set off really easy, by most things usually. Otherwise she's caring, really sweet and honestly the least controlling person I know, if not slightly immature.
Girls, My girlfriend loves me but she is very moody. Sometimes she is so angry on me for petty reasons. What can I do?
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