Hi welcome to H.C.M.Forum. this reading of b.p is not low, it is normal. some times when a person is very thin heart pulsation is seen and heard. anaemia
means blood less ness can cause rapid heart rate
and feeling. as a whole she should increase physic, and blood. she should eat proteine rich food, green leafy vegetables, & fruits.if still she face some problem, she can see a cardiologist. thank you.