Screwed up BOO - Do you intervene?

[Andy]

I answer the questions asked and address the comments that are presented.

"Coach, you have thrown a pitch to the current batter (#6), you cannot appeal any previous batters at this point."

After #6 bats: "Coach, the last batter was #6, she is followed in the order by #9."

Which is probably close to what you did. To do anything else would be providing one team with an advantage. The coaches have access to the rulebook just like you do. If they can't figure out how to make the proper appeal in this situation, it's not your job to do it for them.