My mom has a little guy that looks similar to your girl, he was an escapee from an auction truck with a nigi buck...well, I caught both and they joined my mom's mixed herd, wethered and even estimating Reds age at 4 months old going by teeth, he was a scrawny potbellied little guy.
He's been fed well, wormed, vaccinated and even after a year of this he still hasn't grown very much.
She's a little over a year old, so she is fully grown. We bought her as sort of an add-in to a buck-doe-kid Kiko-Spanish family and I'm not sure exactly where she came from or what her background is. I'm sure she's a dairy mix, but of what exactly, or in what proportion, I haven't a clue. I'm really appreciating everybody's suggestions! Thank you!
She doesn't look to have the bulk of a Boer or a Pygmy...and she will continue to grow til she's around 3 years old, most goats reach their mature size at that age. I'm gonna say that she may be a a cross with a Nigerian, giving that she looks more dairy than meat.
Mature size at 3 - good to know. She is substantially smaller than the other one we have who is also around a year (another add-on, that one more Boer than not, but also some dairy), so I would agree that there must be some Nigerian in there. She has an adorable personality.