@lewam3:
Yes, there are new provisions in the ASA Code (oddly, mostly in the Definitions Section, which is not usually the place for provisions like releases) allowing for the release of players and I tentatively have concluded that the release can mean the sub gets to go back to her old team, at least if she subbed in the same age category. As a practical matter, the issue usually arises only with respect to a roster that is "red-lined" as part of Championship Play, that is, for tournaments that can qualify teams to go either to ASA Regional Nationals (for Ohio, usually ASA Easterns) or ASA/USA play. If your DD subs in a sanctioned ASA tournament that is not "Championship Play", you should be ok going back to your regular ASA team without the official "release" papers, but if it were my DD I would still be inclined to ask the coach of the temporary team not to roster my DD. (Also, just as an aside, if you intend to rely on the new "release" procedure to obtain a release from a red-lined roster, the new provisions say that this procedure has to take place before the local association's main tournament, which for Ohio teams who are sanctioned by Ohio ASA means before ASA States . . . Cincy and Dayton Metro teams would have a different release procedure deadline . . . this stuff gets extremely complicated and especially with a new provision it's hard to tell exactly how the release will play out). (And finally, I don't read the new release provisions to eliminate picking up players for regional or USA nationals; those "pick up" provisions are still in the Code).
But the original questions was whether the player could play up in age group and then return to the lower age group. For the ASA, that is a whole other kettle of fish. I concluded a couple of years ago that a player could not play in two age classifications within the JO Division (which includes Girl's fastpitch) for Championship Play. If I have time and the patience to plow through the ASA Code and confirm that understanding today or tomorrow, I'll post again.