Having seen her played a bit, she's so much better than the first reaction seems to indicate. Daniela is the champion of not doing terribly much but everything still dying, a style of play you really have to lean into.
For starters, run her with lots of soaks. Whether old classics like Cherished Keepsake and Leather Coat or fancy allies like Aquinnah, Peter Sylvestre, and/or Jessica Hyde, there's plenty of ways to stay alive and tank hits. When you get hit, you hit back harder. Someone mention Bandages + Guard Dog already? Because let me tell you, that hurts.
Cards like Toe to Toe and of course your wrench reward you for getting hit. Slam into big enemies and watch them crumble. Get yourself a Fire Extinguisher and watch the enemies tremble in fear. Slot in Brute Force and Stunning Blow and you've got yourself one nasty killing machine.
I would recommend Daniela for bigger groups. I think that if you want the classic combo in 2 , you'll be fine. In 3-4 she can easily be the primary fighter and just destroy enemies left and right.
10/10 would let this lesbian absolutely murder a bunch of babies in Innsmouth again.