Her encounter rate has been boosted but RNGesus is not a kind master. If you have the waystone unlocked, wait near the wayshrine and spam explore. Explore takes less time and if your health or resolve gets low from encounter you can dip back into Hawkethorne. Even after the encounter boost it still took a while for me to encounter her after the first time.
There was also recently a bug where losing to Arona or choosing an option other than Interrogate the first time you her would lock her out. Make sure you've downloaded the most recent public/backer version of the game.