[Andy]

I would not consider calling this to the offending team's attention "preventive umpiring"

Preventive umpiring is not allowing them to do something illegal when they ask you to do it...ie, an illegal sub or illegal Courtesy Runner.

In the OP, it is the offensive teams responsibility to re-enter the DP when she comes up to bat. As mentioned, there is essentially no penalty in NFHS for a first offense, but their is for a second offense and this could be used by the opponent to their advantage.

I had an unreported sub issue in a college game this last season....Coach entered a new pitcher at the start of an inning, but never reported her. I knew it, but didn't say anything and waited for the opposing coach to appeal it as there is a penalty in NCAA rules for an unreported sub. Opposing coach waited a couple of innings until it was to her advantage to appeal the unreported sub....extended an inning and scored a couple of runs.