As the updated foster folly news report says, Tina does suffer from a growth problem both mentally and physically, and at 5 feet tall she weighed around 67 lbs before her pregnancy, and the baby was very small at birth, so 11 lbs is not a surprising weight for me to hear, nor do I assume malnourishment, In the photo showing her body she had baby fat on her legs and arms, she didn't look boney...my son was 22 inches long when he was born, so 2 feet is only 2 inches longer, and 11 lbs is 4 lbs more than my son weighed at birth. If I remember correctly shannon only weighed 3 or 4 lbs at birth, I have a picture of her being held in the hospital and she is barely longer than the persons hand.
I found Tab blogging on another sight under the username sieric which I googled and found a twitter account under the name Tabitha Phillips. I don't know any of Rustys family so I can't verify if she is a family member, but maybe that name will help you guys