her biographical film
... that singer Barbara Mandrell thought that when she saw Maureen McCormick play her in her biographical film, "all [she was] going to be able to think about is Marcia Brady"?
... that singer <a href="./Barbara_Mandrell" id="mwA9g" rel="mw:WikiLink" title="Barbara Mandrell">Barbara Mandrell</a> thought that when she saw <a href="./Maureen_McCormick" id="mwA9k" rel="mw:WikiLink" title="Maureen McCormick">Maureen McCormick</a> play her in <b id="mwA9o"><a href="./Get_to_the_Heart:_The_Barbara_Mandrell_Story" id="mwA9s" rel="mw:WikiLink" title="Get to the Heart: The Barbara Mandrell Story">her biographical film</a></b>, "all [she was] going to be able to think about is <a href="./List_of_The_Brady_Bunch_characters#Marcia_Brady" id="mwA9w" rel="mw:WikiLink" title="List of The Brady Bunch characters">Marcia Brady</a>"?