antique MARY PICKFORD - PICTURE POST CARD For Sale

This picture was found in the back of a drawer of a house that we purchased....it is post card size..on the back simply written in pencil is the name Mary Pickford...I know nothing about movie memorabilia....so I put it on and priced it at .99......a kind person contacted me and say mam if this is really Mary Pickford it would be priceless....So I quickly removed it...and tried to research it...I was told by a Mary Pickford museum that Mary Pickford would have never posed for a picture like this.....I read up on her life and it seems she rebelled in her teenage years....so I thought maybe this pic was part of her rebellion...I just do not know....so I am going to give someone that knows more than I do a chance to buy this or just help me out ...I know this is an odd post....but I dont want to be accused of false advertising....help is appreciated.....Thank you for taking the time to read this..