I think she is Helenka Demidova
Don't think so.
jamesw may not have been right but his was a better guess than yours I would say.
And I only say this because you've asked for the thread to be solved when it is absolutely not solved unless you or someone can prove otherwise.
Your subject has tattoos on both wrists, not to mention that she looks considerably older - to me at least.
And different eyebrows, nose and
even bigger lips than who you suggest.