I mean you can still seek for revenge even tho you married ( to Ian ) ?

But she's also aiming for solia, for that she needs the empress' trust and Ian's household is in competition with the empress, so if she does date/marry Ian before completing her revenge, it'll spoil her whole plan. She did say that she personally wanted to destroy that asshole Howard and that bitch Nora's life, n (my opinion)it'll be more satisfying when she gets with Ian after her revenge ╮(￣▽￣)╭