Starting off her answer with
"Not quite sure what you're asking me" doesn't really inspire too much confidence in the answer.
In any event, at least this thread has given me some food for thought. It had always been my understanding that NFHS interprets the use of the double first base exactly the same as does ASA. Last year I put that question to our local UIC for high school softball and the answer I got was affirmative. My understanding of the ASA rule is that the fielder must be pulled completely off the base, away from it, and into foul ground before this "exception" kicks in.
Would love to see a written interpretation of what NFHS means by "pulled off the base into foul territory by an errant throw".
The folks that have to rule on this protest have limited rules experience, and I doubt that they've ever had to interpret something like this, so I'm thinking that whatever final decision they come to is pretty much going to be a crapshhot.