“wasted”
For more useless trivia, in a similar vein, the longest common word that can be typed using the letters on the home row is FLASKS (6 letters). FLAGFALL (8) can also count, but it’s not really a common word.
She should start a business, training others to do the same. They could call themselves Breastfeederestteachers!
Their adherents could be the bestbreastfed(dest).
safest
resets
detests
crests
swerves
zartfast