What s the best digital blood pressure monitor especially 24/7 or while sleeping?

I'm not sure what having difficulty "finding her vein" has to do with taking a blood pressure.

There is absolutely no reason to monitor her blood pressure while she sleeps. None. Even most admitted patients to the hospital only have their blood pressure checked every 4 hours at most unless they're in a higher lever unit like the CCU or ICU. If you mom isn't sick enough to be in the hospital, checking her blood pressure twice a day is far more than sufficient.

In fact, there is very little need for people to have blood pressure machines at home at all. If you feel sick, go to the doctor. Make sure you get a regular check up where the doctor will measure and interpret your BP.

3 years ago, I was diagnosed - hypertension with a reading of 160/100. I used to feel dizzy a lot, my legs had awful cramps, and levels were very low in my potassium, causing my fingers and toes to always cramp together. One day I started to feel really faint while I was driving with my daughter in the back seat and I passed out, hitting 3 cars and ending up in a ditch. That moment,I knew I had to do something because my meds weren't working. I heard about this diet from a friend and thought I'd give it a shot. The results have been remarkable. In just 21 days, I honestly can't remember feeling this good, my blood pressure went from 175/110 to 125/70.