The 33-year-old said she was invited on the set of Harry Potter and the Deathly Hallows: Part 2 but her daughter Ava, then two, refused to give back the prop.
She said to UK newspaper Daily Record: 'I have to say fair play to Emma Watson actually because she gave Ava, my little one the wand and then when it came time to film, Ava wouldn't give it back.
'She would not give it back. If you give a two-year-old, at the time, a magic wand - they're not going to give it back.
'So cue the director, cue Emma, cue some assistant directors and assistants and goodness knows how many other people trying to prize the fingers of a two-year-old off the magic wand.'
She added: 'Emma was very, very good about it and I made a speedy exit. Sadly I was meant to do the little clapper board but we had to leave early after that incident. I thought it was best. I thought otherwise someone might wave their wand at us.'