Someone posted that we have to think like Julia. (sorry I don't recall who posted it) but the poster was spot on.
Even though it is very difficult for us to do so because we don't have her state of mind, given some of the clues, we should be able to at the very least figure out what her motive was to sell or harm Sky, if that is what happened. I'm not ruling out an abduction yet but I'll go with the most popular theories.
Sell or murder.
We've seen photos of her at what appears to be a bank. Some believe she looked distraught. Was she desperate for money? If so, what for? Was it to pay bills, feed the kids, buy a car, a plane ticket, train ticket? Did she borrow her brother's car because she didn't have enough money to purchase her own? How desperate was she for money? Enough to sell her child?
She uploaded and posted photos of the children on her flickr shortly after Sky's disappearance. Why? What message was she trying to send and to whom?
As we've seen from following other cases, there are many ways to make your child "disappear". What method would Julia use? Was she that evil to kill her only son? If so, how and when did she do so? What means did she have? We know she didn't have a car and nobody saw Sky except for the neighbour.
Did she use a baby broker? Did she sell Sky to an unknown couple or person? Did she have connections to some illegal adoption agencies or connections to the Russian or Ukraine or any other criminal organization who as we know use children for human trafficking, child




?
Was she at the bank that day to try to get money to BUY BACK Sky after he was sold and that's when she realized there was no way she could get the money and the reason for her distraught look?
What was she looking at (gas station?). Newspaper ? Classifieds? Map?
Random thoughts........