Linda's already mortgaged her house to be able to afford the defamation case in Perth.
Chasing any judgement through the French courts would become even more expensive - probably to the point where she'd be lucky to get enough money to pay the lawyers, and likely get nothing for herself.
$2.4M is pretty much all Britney has and the most that Linda could hope to access.
Not a lot of money - especially if you go international - look at the legal bill Bruce is stuck paying.
Linda would become the woman who mortgaged her house so that she could bankrupt a rape victim - over a social media post from the rape victim's boyfriend.
To my mind that is not exactly the repair of reputation Linda is after.