| You need the other characters in play. Colonel Mustard is too cool to be left out of a two player game. I don't know about you little girl but mine sure would love Miss Scarlett. And she would want to visit her.
So, basically, you distribute the clues to all the characters though they do not participate. You invite your daughter to place the characters in the different rooms. Maybe she feels Reverend Green belongs in the Library.
Gamewise you move your co-op pawn through the mansion and interview the characters inhabiting it. Let's say they have four clues each; you draw one and your little girl draws one. You can then chat about the clues reveled for a spell before ticking both off your common list. Then you have to move on, for the character is whisked away to another vacant room, still keeping two clues. | 
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