My friend ended her friendship with another friend with unreasonable reason.

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I recently made communication with my old friends in highschool through facebook, and were excited to know how each other were doing, and then later on i just know from a friend(i will just call her mary) that she and the other friend we have (i will just call her caren) are not in good terms and i was shock how come? and then mary told me that caren get angry when mary told her through chat in YM that caren is so fat already, and because she is fat because they have eat a lot so much, and i ask caren if how true is it, and then i found out that it was true, and to make the story short, mary try to apologize but caren is not responding to her chat's and emails, and just recently caren erase mary's name on caren's list of friends in yahoo and facebook, well in other words caren ended her friendship with mary just because of what mary had commented about her, and i feel sad about it, i feel sad on how they ended their friendship, i try to ask caren to apologize mary but it's just that caren has so much pride and to think her reasons are not reasonable enough to end a friendship. if you were me, how can i help and how should i react?...