I'm sorry but I don't have any suggestions just wanted to give you a

I think you are right, she has figured it is a way to get a reaction so it is interesting to her to see how adults respond. Perhaps try sitting her down and talking to her about the difference between an acident and when something is intentional. I know it might be a bit beyond her reasoning, but it is worth a shot. She may think that her Dad intentionally hurt her foot so she might just need some reassurance that it was only an accident.

HTH

Spring xx