My Mom Is 88 Years Old. Her Bp Was Running

My mom is 88 years old. Her bp was running 187 over 88 at doctors office a week ago. She is on lisinopril 30 mg, provastatin 20mg, and metformin. I just took her bp and it is 110 over 52 in left arm. So i took in right arm cause she only weighs 86 lbs and is brittle. Its 110 over 44 in other arm. Is this way to low?