She looks like a buff brahma to me. She's about 1/3 the size I would expect at this point based on your photos. Genetics are interesting and I wouldn't say dwarfism as it isn't really how it presents in birds quite like this but a defect definitely. It might be ok if it's already made it a month. But it might not live long/ever be too normal. I will be interested to see how things go, do let us know.