it would have been super funny if instead you just said "yeah, i love tablecloths, my great-grandma made this for me, out of the tablecloth they used at her wedding, and she's dead now, thanks for ...

HAHAAH!!! That would have been great!!

on a serious note, don't be offended. Just let it slide, dance with her next time you get a chance, and tell her her shoes are nice, even if they're ugly, cos old people wear ugly shoes those huge ...