Yes, they're real. Implants cause calcification over time which give fake breasts that stiff look. Also her breasts have a natural 2 inch gap in the middle and implants often close that gap (dependent on the natural torso width). Implants also tend to raise the breasts unnaturally towards the torso and hers has a natural sag starting at the armpits. Furthermore, breast implants don't naturally illuminate when exposed to light, when she's backlit you can see her boob veins. Also nipples become much more round and pointy when implanted.
She exhibits none of these features to my knowledge so it's safe to say she's just big-breasted and possibly dealing with macromastia.