She _isn't_ in the script... the man is alone. He also only mentions "shit from shinola" once.
As for why she's French, I stand by her being Deer Meadow's version of Josie. I firmly believe in the Deer Meadow = "Bad" Twin Peaks theory.
Teresa = Laura Irene = Norma Fat Trout Trailer Park = The Great Northern Carl = Ben Horne Cable, Cliff, and the Secretary = Harry, Andy, and Lucy Old Man = Pete Young Woman = Josie Creepy Woman at Fat Trout = Log Lady
I'm probably missing more parallels, but they're there. As someone in another thread points out, Teresa is an unknown with no friends or family and she dies in squalor and obscurity with no one to claim her body. Laura literally had people fighting over who got to claim her body and died as the town's sweetheart.
Deer Meadow is rundown and dilapidated-- Fat Trout and Hap's are crapholes, and in Sam's assessment of the cost of the Deer Meadow PD, we get the idea that it's a cheap operation as well.
Cable is dismissive of the FBI and turns their presence into a pissing contest, whereas Harry was wholly receptive to Cooper off the bat.
Doting Lucy always made sure there was plenty of coffee and donuts availible; the Deer Meadow secretary lets coffee get two days old.
Andy was lovable and innocent; Cliff is hateful and corrupt.
Pete was worldly wise and charmingly folksy. The old man is apparently senile.
Ben Horne was suave, well dressed, and cooly ruthless. Carl is foul-mouthed and trots around in his robe and comes across like an impotent hick.
The Log Lady appeared to offer helpful, albeit esoteric, information. The creepy woman says nothing and just freaks everyone out.
With all of these other parallels, it seems like a simple conclusion that the French girl with the old man would be Josie.