I wonder if UPS or any of those businesses would do the shipping as a charity or at a discounted rate?

If she has the chair info -the weight could be looked up and a call into the variuos shipping companies...
OR
look up DHL, UPS etc online and email them asking about special rates for this situation- discount, chairity, pro bono??

It would be best if someone with both addresses and the chair info did the contacting.