Shame, @Pip47 - but sadly, you can't force them into it. I haven't asked my sister when her last one was (she is a year older than I) - I just hope that she would be smart enough to work it out for herself!
Yep, dumb, dumb, dumb - maybe your experience will prompt her - but try not to take her reluctance to go onto your own shoulders - you've done the best you can to encourage her.
I'm the only one in my family to ever have any sort of cancer - so would hope it can show that anyone can get it at any time & early detection is the best chance of a better outcome.
take care, & all the best for your surgery xx