I think she only hatched one or two, but I kept finding chicks in the yard so I gave them to her. She had so many that they stayed in the brooder when it was cold because she couldn't cover all of them.
@diamondsilkies , I just saw that Metzer Farms will have Mallards hatching on January 8, so maybe call them if you can't find something local?
http://www.metzerfarms.com/index.cfm?affiliate=undef&CustID=17603204
@diamondsilkies , the drake and chicken hen works for me with this one pair, but I still strongly believe that ducks should be raised with ducks, so if you hatch a duckling, do try to find a buddy for it.