Madam. Kindly pray to Bhagwan Narsimha (Vishnu Avtaar) for this. I think praying to Bhagwan Narsimha can help child. Her horoscope shows affliction of Lagna Lord Mercury by Mars, Rahu, Shani and Ketu. To tackle this much affliction to Lagna lord by Cruel planets, a very fiery diety puja and prayer is needed. Bhagwan Narsimha is linked to Mars in astrology. Blood cancer is also linked to affliction to Mars in astrology. So i suggest kindly approach Bhagwan Narsimha through prayers, and Puja and seek his blessings for the child.
Ram Ram.
May Bhagwan Narsimha bless the child.