It was mainly skills. A big factor was DD was the #2 pitcher and pitched a lot because the #1 struggled to keep her pivot foot down. It's a lot more of a challenge for a pitcher because they have to keep pitching until they get 3 outs.So what proportion of your mentioned "challenge" here is mental versus "skills" based?HS ball can be very challenging for freshmen to play against strong HS teams. HS ball was more challenging than TB-A for my DD when she was a freshman and 4 of the other 6 teams in our league were ranked in ESPN's Fab 50.
Her TB team was very good and were very successful playing up in the fall and winter to prepare them for HS ball. The stronger HS line-ups were about a 60-40 mix of experienced PGF-level players and good TB-A players.