My Mother Is Almost 80 Years Old And Her Blood

my mother is almost 80 years old and her blood pressure has been higher than 150 lately and I don't know the lower number in the fraction. Now after being on three different drugs she has blood pressure of 111/59, 128/64 etc and she feels that she has no energy to get out of bed. What is an appropriate blood pressure for an 80 year old woman a little over weight?