Here's how I did it. I used an Excadrill that had a Jolly nature, 252 ev's in speed and attack, Sand Rush, a Magical Seed, Earthquake and Swords Dance. First you take out her Alolan Sandslash with a mon that's weak to ground and has Brick Break or one that outspeeds and one-shots it which will prevent her from setting up Aurora Veil. Then she will send out Excadrill, now you switch to your own Excadrill. Both Magical Seeds activate, which sets up King's Shield. In this scenario, Titania will always go for Sandstorm, this is the moment you use Swords Dance. Since your Excadrill is Jolly, it is faster then hers. Now you have an Excadrill with 2.5 times attack and 2 times speed vs a steel team. Excadrill can solo any mon she has except for Aegislash but she will always send that mon out last so you have 4 team members to take care of it which should be more then enough.