This is based on a true story.
Frida Farrell is a survivor of sex trafficking
The part in Apartment 407 when Isobel enters the apartment is based on the real event of Frida Farrell including the part where she was forced to wear used underwear for women.
When Isobel (Frida Farrell) is seen bound and gagged twice has never been mentioned in the real life story.
"Selling Isobel" has since been retitled as "Apartment 407".