Be the sunshine to their storm

If they ever talk to you cus their upset, be positive. Always point out the good things. If their are no good thing, reason with them and try to understand how they feel. They,ll think that you actually understand them and you know how they feel. They,ll also have a good impression that you,ll actually care to listen to her (and if you actually like each other, this would be no sweat at all) Well that pretty much it. Good Luck xD