The other person is wrong. 120/80 or higher is actually considered pre-hypertensive, which is too high. Your wife's blood pressure is not that low. 100-110/60-70 or so is considered normal. You'r wife's is considered "low normal."
However, she might be dehydrated. She could try drinking more fluids and taking the blood pressure again. Another question I have is how she obtained the blood pressure reading. If a friend did it or you did it on one of those Wal-Mart machines or those machines in the grocery store, you could have gotten a false reading for a variety of reasons. (Raising your arm too high or too low, a cuff that is not calibrated correctly, etc. can all give false readings).
Here's a website to read on the topic: http://www.nlm.nih.gov/medlineplus/highbloodpressure.html. Medline is generally a good website.
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