Small Rural seaside village, we have a community Facebook group for giving things away for free to Neighbours - when my DD started to grow out of her Baby clothes I would often put them on there in bundles for free. The same Mum would always comment first so I eventually would message her directly once I had a bundle to give away and give them to her automatically. Our DDs have now started Reception (School) together so I see her at Drop off / pick up every day, I wouldn't say we were Friends as such but we always exchange pleasantries.
Scrolling through Facebook this Morning and I see this lady has put a huge bundle of the Clothes I've given her for sale on Marketplace - I wouldn't ever say anything but feel a bit strange about it! AIBU?