Most of Willo's kit relies on area denial. After Seedling or Dead Zone have been used, it's better to stay out of reach. Remember that she has quite a large cooldown for those abilities!
Your illusions is a counter to Drogoz ulti; if Drogoz crashes into your illusions, he kills the illusion, not you. Hiding behind your illusion is a good idea, or move towards Drogoz and place ur illusion to soak the ulti for your grateful teammates.