Laura Samson won the other semi 6-1 5-7 6-3 so Mika plays Jeline (who beat Mimi at Roland Garros). The difference between third and fourth is 60 ranking points (480 vs 420) and $1,500 travel grant (on top of the $11,250 she has won already )
I've always thought those places matches are a bit of a nonsense - you just don't have the same motivation and it's difficult to get yourself pepped up
It'll hurt that Emerson won, though, given Mika was two points away from beating her and it was completely on her racket