If you don't get what's going on: I'm indicating that ponies are racists.
/EDIT: If you disagree/agree with that - both is fine with me. Just don't be all bitchy about what you believe, ok? Thank you.
Derpy is a pegasus, Dinky is a unicorn. If Dinky is her daughter, that means her father must have been a unicorn (/EDIT: Baby Cakes taught us that doesn't have to be the case. My bad!). Unicorn + Pegasus = racist ponies go wild.
What might really be going on: Derpy is being made fun of because of her eyes.
Dinky doesn't get that; she doesn't understand why her mommy is being laughed at. So, she somehow comes to the conclusion that it must be her fault for not having wings.
There are a lot of possible explanations for this. Be creative.
This is more of a "what if" situation that Dinky thought up. Probably.
So don't mind her turning into an almighty alicorn for no reason.
I realize that Derpy's pose is awkward. This is the first time I've drawn a pose like this, so bear with me.
/EDIT: Changed a few things about Derpy.