Her journey to reach this point has been a circuitous one.
Natural – perhaps hereditary – talent has blended with hard graft to overcome repeated health challenges and establish McIntosh as one of the world’s best.
Before her sister’s successes, dad Donald and mum Shirley were Commonwealth Games shooters themselves. Not that it looked like Seonaid would follow their paths.
“We were never pushed towards shooting, in fact Seonaid never wanted to do it for a long time,” Jen tells BBC Sport.
“We are quite similar, quite competitive, so that made things like board games interesting at times.
“She says it like it is and yet she was very much an old soul, always had a bit of a plan, was quite shy at times, a bit awkward now and again, but very mature.”
That plan looked like being a musical one. Like her sister, Seonaid went to Dollar Academy and became part of the school pipe band, run by Craig Stewart.
And it just so happened that Stewart was also the school’s shooting team coach.
“Seonaid is not a big lass but she would carry this tenor drum that is 20 inches in circumference and try to march in time with strapping young lads at 6ft 2in with strides like giraffes,” he recalls.
“She was is in the middle of the band trying to keep up, but she never complained. She is fantastic musician – she plays the drum kit as well – and was a world champion in piping and drumming with us.”
Such was her talent that, at one stage, there was even talk of McIntosh going to prestigious music schools in the United States, explained dad Donald.
“Music was her thing and that was the route she followed for quite a long time,” he told BBC Sport.