The number of player limit reference is mainly for teams coached by the High / Middle school coaching staff and the 50% rule #7. At the HS level/age players do not play/practice year around with their travel team like they can do under 14. Teams generally will get together up until the no contact period Feb-May then resume in early June late May.
Now there are many teams made up from ladies from the same HS/middle school at the B and C levels that play summer and fall ball.
I know of several other teams with 6 or more at the lower A level that play from late May to Aug 1st and a couple fall events coached by "non school" district staff.
Now, Covid protocol changes did create some changes last season and OHSAA opened up coach contact but honestly OHSAA has better things to do than check the rosters of 1000s of summer softball and baseball teams that change every August.
Back in the day what we did with the HS teams was fall ball in some weekday fall HS leagues and Sunday winter leagues. Travel players on the team played weekend tournaments with their travel teams in the fall. In the summer the ladies not on a travel team played on a team in the HS league.
Here is a quick ruel guide:
https://www.ohsaa.org/Sports/sb/girls/2016/SummerTeamAdvice.pdf