Dhruba, I am glad to hear that your wife's sister is a match, but sorry you have to wait until March for the transplant. As Neil says, the main concern now is her ANC and the increasing risk of infection. Does your doctor in Dhaka have access to G-CSF drugs like Neupogen or Neulasta? These are growth factor injections that can stimulate white cell production. Unfortunately they are very expensive, and it sounds as though you are already going to be hit very hard financially.
The alternative is to take as many precautions as possible to keep her from being exposed to sources of illness or infection. She should avoid any unnecessary contact with other people and wear a surgical mask if possible. Eat only foods that can be peeled or cooked to eliminate bacteria on the surface. This description of the "neutropenic diet" may be written with US patients in mind, but it may help give you an idea the kinds of things to be avoided:
http://www.rd411.com/index.php?optio...ets&Itemid=383
I hope all goes well!