I had something similar in a HS tournament game earlier this year....
R1 on first, takes off to steal second, F2 throws to F6, I see F6 catch the ball but never move the glove to tag the runner, I call the runner safe.
Def coach comes out to ask what I saw, I told him I never saw a tag. He wasn't happy, but went back to his dugout.
At the conclusion of the inning, same coach comes up to me and says, "My player told me she tagged the girl." I told the coach once again that I did not see a tag.
Coach says..."So are you telling me that my player is lying to me?"