She needs to distract herself with other things...work, activities, socialize more, take a course, start her MBA, etc. Getting over a relationship is not easy and some parts of it - the grief, the feeling of emptiness, the void - are things you have to go through. Its natural and there is no way to avoid it...part of the healing process.
She cannot jump into another relationship right now, that is out of the question. Otherwise, she will punish the next person in her life for what happened to her, unknowingly.
I totally agree with Bon. The aching emptiness and void-like feeling are challenging to get through when you are trying to get over someone. Keeping yourself busy, developing yourself as person, and getting to know yourself as an individual by pursuing your interests....does provide not only healing but confidence as well:)