Here’s what I think we know:
The quote is “I’m very [sorry],” with “sorry” being mumbled or hard to hear.
It’s spoken by an American actress who starred in a TV show that was on in the '70s but not just the '70s, and the actress (inferentially) was not on it in the '70s.
The speaker has a number of lines during the first 20 minutes of the film. Inferentially, she is either gone or sparsely present after the first 20 minutes.
The line is spoken during a group scene.
The film was produced solo by Cubby Broccoli, meaning it’s TSWLM, FYEO, OCT, AVTAK, TLD, LTK, or GE. (MR has been ruled out.)
The actress is not Barbara Bach or Tanya Roberts.
Have I missed anything?