If I quest with Moana – Of Motunui and use her We Can Fix It ability, can I choose which Princess characters I ready? If I instead ready them with other effects later in the turn, can they quest that turn?
No, you can’t choose only some of your Princess characters for We Can Fix It. When you use the ability, you must ready all of your Princess characters. If you don’t use We Can Fix It, your other Princess characters can quest as normal and you can ready them with other abilities and effects later in the turn.
Official set release notes — Fabled