> She was only 47% to win the hand after her call of the all-in bet and while the play was marginally +EV, it wasn’t much.

That's not what it means to make a +EV call. Expected value is estimated based on the opponent's presumed range. In this case the EV of the call was extremely negative EVEN IF we assume that the all-in was a bluff 100% of the time. Problem is that jack high usually doesn't beat a bluff in this scenario. If you adjust that 100% to something realistic like 60% or 30% or whatnot, it becomes even more severely -EV.