It is the only way to make her your GF.Im guessing Lydia can’t be made your Girlfriend without playing the D&D right?Or is there another path to make Lydia your Girlfriend/Apprentice?And how do you get the Scene with Issyr/Lydia?
But there is an alternative to making her your apprentice. On day 1 at the bar, show her your color magic. This option requires that you don't meet her at the gift shop, or you called her a cunt. Showing her your magic sets a variable to true and on the Monday after the wedding you can get her to embrace her powers.
To get the scene with the queen you need to sign a contract with the queen. I think it also requires Lydia be your apprentice which means doing D&D. I could be wrong on that though.