ruling?

[refTN]

I had a super regional AAU game which of course goes by women's ncaa rules. It was under a minute left in the game with team A down by three with team B in possession of the ball. The girl from team B drives to the goal and gets fouled in the act of shooting. Before any free throws are attempted there is a timeout taken. After the warning signal had sounded on the timeout a girl tried to report in and I did not let her. After the first attempted free throw I still did not let her come in. I explained to the coach that since the clock had not properly started she could not sub in, but if he took a timeout after the made or missed free throw she could come in. So that is what he did.

Was I correct in my ruling according to ncaa women's rules or NFHS rules?