My female dog thinks toy is her baby!!!?

Hi .. I have a two year old Lhasa apso. She was perfectly normal but from the last three days she thinks a stuff toy is her baby.she starts crying and keep searching it until we give her back. She's also not eating properly . She licks it n try to sit on it in an awkward position. What's wrong with her??? I m 30 weeks pregnant. Is it possible that she is thinking like this because of my pregnancy??? Plz help!