Stick some plastic ivy around it to hide him. Just dull the greens down a bit. You can always have an eye peering through, just enough to say 'I know you wanted rid of me. I'm watching you". That won't freak her out!

What you need is a wireless speaker placed near the tree so that you can play maniacal whispering sounds, sort of like Gollum having an argument with himself. She'll laugh at that.
