A couple of months isn't much to get over a long-term relationship. It doesn't happen over night. Took at least a year for one of my best mates to get over his gf, he had some serious issues, errection problems(couldn't get it up when he was with other girls) etc.
Just be there when your friend needs to talk about it, unless she is fragile to depressions or other psychological illnesses she will get over it with time.