I took DS and DD swimming today. DD got out to use the children's slide. In the meantime, a lady put some ear plugs in and the container on the side of the pool. DD tripped over this as she turned around and fell over onto her knees. The lady came over and said that DD had knocked her earrings that had been in the (open) case down the drain. I apologised but couldn't hear her too well as I was consoling a crying DD over her sore knees. When DD calmed down, the woman demanded I pay the £100 the earrings apparently cost. I apologised again but said it was an accident and there's good reason for the signs saying to leave valuables in the lockers provided in the changing rooms. She began swearing at me so we moved away but I saw her complaining to staff later who didn't approach me so I presume they were of the same opinion as me.
AIBU to not have agreed to pay?