"Try to have a calm and open conversation with your daughter," Mazza writes.
"Don’t force her to communicate and make sure you don’t appear to be judging what she’s saying either, as this can cause kids to shut down. Let her know that you are a protective and safe person in their life with whom they can share anything with. Listen without investigating (leave that to the authorities, as you can jeopardise an investigation) and let them know that they are not in trouble."
It is also important to keep in mind, the therapist argues, that we all tend to parent the way we are parented.
"For your ex, he may have bed-shared with his parents until he naturally grew out of it, and for you, perhaps bed-sharing wasn't a part of your childhood. So it is expected that you will have different views on what is appropriate and what isn't."
Mazza also recommends speaking to the child's father – her ex – and ask about the reason for having their daughter sleep in his bed when she is doing sleepovers.
What do YOU think? Is it appropriate to have an eight-year-old in the bed? And where do you draw the line?