Going tru dis thread, I cannot help but shake my head in disgust. Can we not just love animals for d sake of loving them? Must something be expensive before we love it?? No wonder we prefer even imported toothpick as against Nigerian own, d level of understanding of some Nigerians is SHOCKING..! Obviously d only crime op has committed is buying a dog, must d said dog cost 1million naira before Nigerians assist d op?? Like I've said earlier d poor dog needs help, if your advise is reserved for only pedigree animals please keep ur pedigree advise to yourself.
I will still insist that you take her back inside ur apartment.. its just like changing a kids environment, your dog has barely adapted to her new environment, she needs to be constantly around you/members of her new family, the whole noise and movement in and around the house...
with enough patience and close observation I'm sure your puppy will turn this corner.
My honest advice wouldn't be to give up & sell the pup..

Op from my own observation, u complained that ur co doesn't run around freely, my first suggestion is to work on d floor (base) of ur dog house. For an adult dog it may not be an issue but ur puppies bones r still in their formation stage(s), an uneven surface like that will not help smooth movement inside the dog house; puppies r like babies n should be cared for as such. First may I suggest a level(flat) surface for the floor, u can even add a soft cusion/cloth if u have any available. I can understand u did it probably cos if their waste, but u will have to train them over time not to mess up their living area. Secondly I strongly suggest u move ur co inside ur apartment, personally I dont like wen pple get puppies & immediately toss dem into a dog house. Let her live inside wit u while u monitor her closely for at least 2weeks, u can bring her outside at intervals to run around while still monitoring her. If u notice depression in ur bb as a result of missing her sister, please move her inside as well. I wont go into feeding cos I think others have made valid suggestions, u can try dem & see wat works best for her..

Been a silent observer on this forum, I opened this account just cos I felt d need to add my 2cents & I can tell this op needs genuine help. Pls op u bought a 'DOG', its not your fault things haven't worked out as expected yet, u dont owe ANYBODY an explanation as regards price/purity of ur pet, NOBODY should make u feel any less. Pls dis op needs help for his DOG, anybody dat doesn't have any meaningful suggestion should kindly stay away and observe..