Fasting blood pressure

Hi,
I need some suggestion on my mothers blood pressure.she is doing fasting from last 7 days.but in her fasting blood pressure is going up.she used to take medicines every 3 days.but now she has to take everyday.before it was 140/85.
139/90.its something like that.now it is 170/90,or 175/100.
please suggest me any one experience this?
Thanks