Her sister does it too and gets paid a lot more because she is smart and has a good education. Apparently the egg company makes a profile of your life and families are able to decide whose egg they want and they have to pay more for 'successful' women's eggs.
The donors are also paid based on how many eggs they harvest each time. They have to go on fertility meds. I guess last time they were able to get 36 eggs in one donation.