Sorry about this! Sometimes Suzy crashes or doesn't get triggered properly by her Magic Hat. Usually just pushing her hat up and down again will sort this out. If the problem persists usually a simple restart of Suzy will fix things. So unplug Suzy, hen plug her back in, wait till she bleeps, then you are good to go again.
If Suzy is unresponsive (permanently playing no music or lights) she may have a fault. Please email email@example.com and describe her symptoms and we will get you fixed up as soon as we can.