She doesn't work very well with the doll, since you can't activate the doll's passive normally on her. The best options for her now are Anaxa, Argenti, Jade. Depending on what element the enemies are vulnerable to, each of them is suitable in their own way, in terms of damage, Anaxa is the best option, Jade is the best option in terms of versatility at the moment, since she is not only Erudition but her skill also buffs the character.
As for lightcons in this game, if you're playing casually purely for the story, 99% of the time they're never worth pulling unless you're trying to complete Apocalypse or Abyss with all the stars in 0-3 rotations. In most cases, adding another character to your account to create a group with perfect synergy will always be better than LS. It also gives you more choice and flexibility when creating groups on your account.
But this is your account and it's up to you to decide what to do next.