helloo.. usually hyperthyroid patient have higher metabolic rates... its quiet possible dat der are hormonal fluctuations leading to changes in appetite...or might be due to any of the underlying disease... let her tk her tabs on time... maintain low salt diet taking bp into consideration... get her thyroid profile tested if not checked in last 3 months...appetite related issues is less likely due to her bp issue...might be because of thyroid or helminthic infection..she can as well tk a dose of deworming if not tken in last 1 month...take a physician opinion on dis as need to check out on anemia too...