That sounds about right. She's about an inch shorter than I am (I'm 5'3") & I'm a zero. I weigh about 112, but she is definitely more muscular than me. My body fat is at about 15%, so I would guess she's at about 11-12%.
Bearing in mind, Cathe's shape/weight/etc probably changes much like bodybuilders. I would guess she dieted & trained really hard before she filmed the Hardcore series, & went back to a more moderate routine/lifestyle after.