hi ting,
oh dear.. sensitive issue. ok.. basically.. traditionally the PJ & Tables go hand in hand and ur mum is right to request for the APs back according to tradition. To focus on the solution to resolve this issue...
Here are my suggestions (but u can dun implement if u do not agree):
1) speak to ur mum calmly abt this issue. maybe ask her to give u back the APs but negotiate for a fair amt of PJ say 5k (in between the 7k & 2k for ur hubby)
2) Inform her that if you do make money from the dinner, u will give her some from the earnings if any?
3) try not to use phrases like "u think u sell daughter etc.." this will anger her more.
4) like what OL suggested, u try to find an aunt who had done it before and its reasonable in the demands for PJ & GDL items and get her to speak to ur mum.
5) If ur mum wants to take the APs, by right she can.. by informing the relos she taking XX tables, but after the dinner u can do a side arrangement like (1) above to take the APs back from her. cos the relos will give her the APs direct during the dinner if they know how many tables she taking from the groom side. So not to make ur mum lose face.. she can do (5) above and return u later. then also.. she wants to take the APs cos she needs to record down who gave how much. this is some un written law.
To think of it, our mummies have spent many years taking care of us, spend on us for education etc.. so by tradition she is also not in the wrong. so do not get upset. we owe our mums more than just this wedding.