a friend of mine got cancer, what should i do? and what can i do?

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she is also my colleague, only 30 years old, and also a mother of a 5-year-old boy. we graduated from the same university and work in the same office. she was diagosed with breast cancer and had an operation last year. but relapsed twice. now i heard from others that it deteriorated and in its late stage. she is so brave as never to show any sadness. i am so shocked and detressed about this. i am upset for a long time. i don't know what to do and what to say. i even dare not face her. what can i do to help?