Moma duck not taking care of her own babies

[Chick and duck mom]

I have a mama duck that is going thru her first brood with eggs. I actually had to get some duck eggs from a nearby farm, because she didn't have any. She took to them right away. She's been sitting on them longer than a month. One egg got out of the nest and rolled down the ramp and broke the shell. Tried to keep duckling alive, but it died. Today I went out to feed and she's making a big racket. I see a broken shell and then see a duckling in the corner. I thought it was dead, but it wasn't. Tried to put it in the nest, but mama was going crazy. I brought it in and put it in the incubator . Plastic box with heat lamp above. Should I try to put it in the nest when mama duck is off?

 

[Miss Lydia]

How are things going now did you take the duckling?

 

[Chick and duck mom]

I have the baby inside in a box with a heat lamp and water and did

 

[Miss Lydia]

Anymore pipping? You might have to take them all as they hatch. Hopefully not.