Hello there we undertsand your feeling and her condition and your concern towards her. And weakness is very common among women among the reproductive age group. There are some factors that are to be taken into consideration such as the
thyroid levels amd are the menses regular and how about the bleeding she is having is it heavy or low, and of there is any problems while working as such as breathlessness and also
vitamin deficiency. These all are taken into consideration. Take her to a doctor and let him evaluate her.
Thwnk you