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.
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!