"She’s not been speaking to anyone, including her family. She’s been on a total timeout," Golan told ET's Jennifer Peros during a phone interview on Wednesday. "Any interviews given about her are completely not true."
She added that comments made about the drama by anyone but Lohan are "pure speculation."
Golan and Lohan, who turned 30 earlier this month, are currently vacationing together in Sardinia, where they Instagrammed a smiling selfie on Monday.
"Lindsay hasn’t even had her phone with her, except for taking some private photos," Golan explained. "She's enjoying a lovely holiday and some downtime now in Europe with her girlfriends. She’s working her matter out privately, as she’s stated. Sometimes the best therapy is a pause."
On Saturday, Lohan called Tarabasov out in a series of photos posted to her Instagram, accusing him of "not coming home." Later, she posted a pic of him with another woman, which she captioned with another accusation of cheating.
"I am sorry that I've exposed certain private matters recently. I was acting out of fear and sadness," Lohan wrote. "We all make mistakes. Sadly mine have always been so public." Check out the video below for more on the Mean Girls star's open letter.