Considering she gets horribly bitter and spiteful when she's angry (no idea why you seem to enjoy putting up with this, but anyway), you would do well to give her the space she seems to be needing.
If she hasn't calmed down by the time she returns, then you need to seriously look at whether or not this relationship is stable enough.
Also, when she does return, don't mention anything about her being mad. Don't ask her if she's still mad. Don't mention the issue. The FIRST thing you should say is, "You have no idea how much I missed you!"