Shes reluctant to go on medication as this may make it difficult to have children

Blood pressure that high (180/100) is not something to procrastinate with. Forget the children. I don't wish to sound melodramatic here, but if she does not get it under control, she may not live long enough to have children.

There are many factors that cause high blood pressure, many of them (most of them, perhaps?) beyond the control of the individual: genetics plays a big part, or perhaps there is just something not quite right in the part of the brain that regulates blood pressure.

Don't mess around with this. Get her on medication now.

tanstaafl.