she's also one of the only characters who can actually benefit from the 2-pc wuthering set that also gives damage reduction, though it's up to your pref whether you want to run it
my personal rec for building her is stack HP, but consider giving her one piece with def% main stat unless you have a lot of def% in your substats, because having a big stack of HP doesn't mean much if you also take a lot of damage (especially when she soaks up aoe damage)