MW says blood pressure is too high - what do I do?

[RadlettWomble]

My sister gave birth just over a week ago, and now has high blood pressure. MW has not told her much information, only to say that it is a problem, so she is worrying. What can she do to reduce it? Why is it a problem?
It seems to be going up, rather than stabilising or going down.
How high is a problem? How long should it take for it to start coming down again?
Any help would be appreciated. Thanks

Bit amiss of the MW not to advise! I'd tell her to see her GP asap. Did she have high BP during her pregnancy?

I had high BP before and after the birth. My MW advised me to go and see the GP afterwards to get it dealt with. I was on medication for a couple of weeks and then GP took me off because he was happy that it had gone down to a reasonable level.

Is there anything she can do to help bring the blood pressure down, as well as taking the drugs?
Should she be sitting down with her feet up all the time, or is it ok to be going for gentle walks around? By the sounds of things she hasn't been given any advice by the MW.
She is bf.