When my husband and I travel, we take the 7-day pill containers with meds and the prescription bottles. For my own convenience, I put the pill container in a baggie in my handbag, but it's not necessary. I put the bottles in my carry on bag. Neither of us has ever been questioned when going through security. We take the prescription bottles in case our trip is extended (don't want to run out of meds) or if we are ever questioned concerning the pills in the containers. My flights are all domestic, but my husband flies internationally, too. My mother is on several heart meds, and has never had a problem with her pill container but she brings the prescription bottles, too.

I don't know about the rules concerning the pacemaker, but if possible I'd place the card with her ticket and ID ahead of time so she doesn't forget it. I have a lot going on at this time, so I place anything I don't want to forget with my e-ticket and passport.