This makes sense.I could still see it being someone who is obsessed with/wants attention from/wants to hurt or inflict pain on SG. They are local to Tucson and can't reach SG in New York, so they decide to target her family. Maybe they've been stalking both her sister and her mother for a while now. They pick last weekend ahead of SG leaving for Italy and abduct NG.
Sending ransom notes to TMZ ensures maximum publicity of SG's pain. If they really wanted money, they would've contacted her privately and told her not to involve LE. But the way they went about it (TMZ and two local stations) feels like the person wants attention that they can watch on TV and they also want SG to make videos pleading for them to let NG go. It's not really about money--its about spectacle and control and inflicting pain on a person they've become fixated on (the reason could be quasi-political, romantic, or some kind of delusion we couldn't guess).
If it were a premeditated actual kidnapping, why buy a printer, create a ransom note, trash the printer so it can’t be traced, leave tge glove-handled note on the premises with instructions for a drop?
All of this delay & sending of multiple messages to media is just putting the perps at risk. Who does this if money is really the object?