My daughter were diagnosed of lymphoma.can she take multivitamin?or what vitamins can she take?

YES- but controversy: This depends to some degree on what treatment she is doing. Many oncologists (incorrectly) believe that vitamins can interfere with chemotherapy & radiation, but a large body of research shows that not only does it not interfere but actually reduces side effects while improving effectiveness. See www.Laddmcnamara.Net/2012/03/should-you-take-vitamins-supplements-during-chemo-or-radiation-therapy/.