Okay, after sifting through kemono I found a photo that proves that she's using a doll beyond even a shadow of a doubt
You may actually be onto something here. From kemono, it looks like she occasionally still posts cosplay of her real self, but ONLY if it doesn't show her full body. There's a Kafka cosplay where she's eating grapes in a tub (bathing in milk? The world's most minerally water?
Cum?) and I'm pretty sure it's actually her, but she's only visible from her shoulders up.