First of all, except MDTB(multi-drug resistant type), other varieties of tuberculosis
do not indicate an abortion because Rifampicin, INH, Ethambutol
and also Pyrazinamide
have not shown any birth defects when used during pregnancy. Yet, if you do not want this baby, you can consult your doctor and go for a medical abortion
since it is very early pregnancy. The weakness could be due to pregnancy as well as the disease she is suffering from which is known to reduce resistance. Take care.