Chrysalis's plan might've failed in Canterlot, but she has a plan B.
To have a changeling/pony hybrid (thanks to a late night with Shining) and use the child's powers for her own doing.
But when a regular earth pony (that almost looks like Shining) spawns with absolutely no changeling features or powers whatsoever, she realizes that, not only will she bring it to the father, since she has no idea how take care of a pony, but that that was her last shot at getting food for her subjects. Her plans at helping her children have failed one too many times now.
Maybe she shouldn't try anymore...Maybe she should just...give up...give up and take this abomination away from her so she can finally end this!
Unless the child and his step parents can change that.

Authors words...yo: As per usual. Editing by Alticron.
and don't worry. This is Chrysie's story here. Not Shining's.