Exhaustion had rooted itself deep in her bones and the last few days , no matter how much she slept , she could n't shake it . She 'd woken up that morning with a headache and struggled with it most of the day . She could n't take anything because no one knew how any kind of medicine would affect her . Besides , taking something meant admitting to someone in her family that she did n't feel good .
According to the above context, answer the following question.
What may be the reason why she ca n't take medicine for the headache ?


She has a condition that may affect how the medicine works or does n't work for her .