It sounds to me like her rant about not knowing what to do with the pants was just a rant - she wants to keep them and plans to wear them. When you offered to take them off her hands she basically accused you of stealing them. I think you tried your best to rectify it, but she just wants to be mad.
If she presses it, I'd tell her that you felt horrible and tried your best to make it up to her - offered her money, replaced the pants, and even offered to dispose of the old ones - and then pointedly ask her flat out exactly what she is wanting from you.
If she presses it, I'd tell her that you felt horrible and tried your best to make it up to her - offered her money, replaced the pants, and even offered to dispose of the old ones - and then pointedly ask her flat out exactly what she is wanting from you.