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!
If your Sticky Bomb is stuck on Seris and she uses Shadow Travel, the Sticky Bomb stuck on her will still be visible. You can track her down that way, but you won't be able to attack, unless you decide to detonate your "tracking device".