My friend won't eat!

One of my friends just broke up with her boyfriend s now she's kinda depressed about it, I'm worried about her though because whens she's depressed she doesn't eat (she eats a little but might throw it up) she's lost 20 lbs in just under a week. plus she does sports so she's always exercising . what if anything, should I do ? (btw sorry if this is in the wrong section)
My friend won't eat!
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