I found it! The missing painting has been recovered! It fell down and then bounced behind this big wardrobe I have in my room.
So now she is back where she belongs…with more blu-tack.
I did the tedious job of cleaning my room yesterday and now I have the satisfaction of wandering around the room without breaking CD cases, tripping over books or stepping on boxes of Shapes that I was going to bring along to some event or the other, but I forgot. Another plus side is I found so much more stuff to stick on my wall.