Wanda is doing what she does best, which is to say she is practicing witchcraft. She's got some sort of long strip of bright red cloth, which she is tying to a deck banister. It's rare to find anything that deeply dyed, but not quite as rare as, say, very blue fabric, so it shouldn't attract too much attention.
You know, if the weird woman doing her rituals doesn't catch eyes first. --although on The Hellequin? She might not, really. There are lots of other weird things to look at.