From
http://www.nexusmods.com/fallout4/mods/20367 :
> Usually, declining to pursue the romance (or failing the speech check) for a companion will trigger a cooldown before the companion initiates dialogue with the player to allow them to try again.
For some reason, Curie's dialogue for this wasn't configured to permit this, and as such, the option to romance her is available only once; this mod is my attempt to correct that.
http://www.nexusmods.com/fallout4/mods/20367 has a fix for this, but the author hasn't yet responded to whether it can be included in UFO4P.