I've updated my game to patch 3 and I still don't get the scene even though she says tonight I will be hers. Might have to restart the adventure for the fix to apply
Starting a new save doesn't affect it at all. Her romance interactions are just bugged still. Patch 3 didn't adjust anything about the bugged romance, it fixed other bugs she's associated with like her dialogue after an Act 2 boss being stuck on repeat until you killed and resurrected her.
