French national Ms Garcia-Bertaux, from Richmond, was last seen on Saturday night at a supermarket in the area, but she was messaging friends on Sunday night when it is understood she was planning on going on a date with a “charismatic vet”.
Producer Hester Ruoff, who worked with Ms Garcia-Bertaux on a number of projects including Gerry with Joan Collins, was among those to have talked to her close friend hours before she was reported missing.
She told The Telegraph: “I am just absolutely devastated.
“It’s very, very rare in our industry that you find someone you trust in a way that I trusted her. She was just the most trustworthy woman with so much charisma, so much spirit.
“Laureline was incredibly loyal – she had my back 100%. She would give up her contacts for the benefit of the film, which is just so very, very rare in the industry.
“She became so much more than my line producer, she became a very close friend. She was just so spirited and very loyal and when you find someone like that you do everything you can not to let them go.