Yes, it is working at 100%. When I was at the doctors office they explained that it is working everytime her heart beats. They told us that the lower right side of her heart is bad. They said the pacemaker is set at 60bpm to keep her heart at a steady beat but when her blood pressure is taken the lower number is always in the 80's. I tryed to ask could the pacemaker be set to high for her body.
Have you found out how much her pacemaker is working? If it is working at 100%, she could have these symptoms. My mom's pacemaker was working at 100% when sitting and a little less than 100% when walking around. She was dizzy, confused, forgot things, tired, and depressed.