A high end attacking player is unlikely going be moved to defense unless there are people that are on the team that are better attackers ( that’s essentially what the USWNT coach said about Dunn). I understand Dunn isn’t thrilled about playing that outside back position, but she probably doesn’t get the playing time as an attacking player
being Versatile as a player is a skill that coaches really value( and it can get your son or daughter on better teams )
My daughter recently played against a dominant #9 that lit us up for 3 goals in the first 20 minutes . She was moved to central mid in the second half , then to CB the last 15 minutes . She was awesome in all three positions . That will serve her well when she inevitably attempts to play for a higher level team