Not that I’m aware of. Basically, it comes down to numbers. The W has spots for only 144 of the very best players in the world. Team budgets are limited and rookies are cheaper than veterans. So a player like Cox has 2-3 seasons to establish herself as a “star” in the W or the league moves on to a younger player.
Hoping that Liv is that younger player. But make no mistake about it, if Liv makes the team as a rookie, in 2-3 seasons she could be in the same position as Cox, unless she takes her game to the next level.