I know haste can normally only be used for the attack action "one weapon attack only" but when a bladesinger 6th level or higher "..... whenever you take the Attack action on your turn ... you can cast one of your cantrips in place of one of those attacks."
So can she take the haste weapon attack and then promptly cast a cantrip "in place of" the attack?
So can she take the haste weapon attack and then promptly cast a cantrip "in place of" the attack?