OPs link, copied and pasted, actually
includes a little bit of code enabling her
or presumably the ad agency age works for to track people clicking it. It's a way to evidence how a marketing campaign is working. I'm not the first poster to spot it either, it's not rocket science.
You have all merrily clicked away for her.
Even without that this whole thread is clearly a nice little ad for the bag, or a bit of market research on how the typical mumsnet user responds to it.