It appears that the film we were working on was actually a number of frames stuck together - so where we thought the image was a single picture featuring all three girls, it should actually have been a series of single images featuring the same background narration. It took some work but we were able to separate the frames and provide a clearer image. That said, in the interests of completeness, we are also providing the image as it first appeared to us during the restoration prior to separation.
And as an added bonus, once we discovered the issue, we were able to apply the same process to the previous image in the sequence.
We'll keep working on this project and posting updates as we can recover more data. Thanks for the feedback.