Obtaining withheld property

I helped my apprentice at work move out of a property with a rather toxic house mate.

We couldn’t take her fridge and a dresser on the load. Plus the house mate had locked the door containing the dresser and was not at the property.

My apprentice has paid for these items and her house mate agreed that they would remove them from the property and return them to my apprentice.

She has since been blocked by the house mate on social media and will not reply to her messages about getting her property back. My apprentice has even messaged the house mates parents with no response either.

What are some suggestions on the next step to be able obtain her property back?