My vote goes to Mischa Barton. My wife loved her work in The OC, which fizzled after she left the production. And she has that vulnerable look the others are lacking.
The problem with making a movie about it is hollyweird will probably muck it up. The girl was average in appearance at best but I'm sure some cute thing will be cast and they will probably throw in some sex scenes and violence to cater to the low brow crowd.
I think the average looks of Anna Sorokin worked in her favor as a grifter.