Could be due to anxiety. Does she suffer from any medical condition or take any daily medications?
Anxiety activates the sympathetic nervous system which leads to release of hormones that will lead to increase in the pulse rate which can be high. Having an increased heart rate is a common symptom when anxious. Therefore maintain a log book of blood pressure and pulse rate whenever you measure them and show the log book to her doctor so that her doctor is aware that the increased reading in the hospital is due to anxiety.
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Yes if it is raised even in normal settings then this needs to be investigated. Otherwise it is fine.
An increase pulse rate in normal settings without any stress is abnormal and needs to be investigated. Some types of cancer may indeed raise the pulse rate due to secretion of hormones. But increased heart rate has many causes.
Take care. .