I wouldn't give a refund at all, you came back and even provided sheet cakes to make up for what fell. It's not your fault, so don't feel bad about it (easier said than done, I know) Tell her to suck it up and move on to the DJ for the money like someone else mentioned lol. Honestly though if it were me I wouldn't refund her a penny, it wasn't your job to babysit the cake..only to provide the cake and you did just that.
Just wanted to add, if you feel you have to give her something then give her a credit or a voucher for a free 6" anniversary cake or something..
Just wanted to add, if you feel you have to give her something then give her a credit or a voucher for a free 6" anniversary cake or something..











