Re: Bummed out...advice?
In my opinion she should have to pay return shipping to you. If you did the diapers per her specifications and it's not your fault they don't work, then she should pay return shipping since it's not your fault.
If however you messed up the sizing, then I would think you should pay return shipping.
If it's just that they didn't work for her child, perhaps you could resell them as used on FSOT?