Eh breasts don't react to low body fat percentage by growing. And yes she's definitely in a dangerous to bordering dangerous zone when it comes to body fat, steroids I don't think so, or at least not necessarily.

Oh yeah they have muscle implants, butt implants, you name it.

That said these abs dont even look close to fake. A lot of the extra definition is the result of her having just worked out and having a pump, being sweaty and shiny, flexing, and the angle and lighting. I suspect even headon it probably would look more like a 4 pack and if she were to adjust her posture and angle it would turn into a relatively flat mildly defined belly. Thats how 6packs be tho. People chase them so hard but even when you reach the level when you can get them you're usually one flare up of gas, or drink away from them melting away. It's doesnt make it any less impressive though getting abs is hard, just like the weird reaction that shes some kind of like professional level body builder on steroids or needing implants to get that far is silly.

No those are the abs of someone who works out a lot.