If the perp didn't know NG was the mother of a famous and wealthy person, I don't think it was a kidnapping for ransom.
If the perp did know, then I do think it was for ransom.
Stating the obvious, I suppose.
jmo
I think
if the perp was someone who did odd jobs, they may have seen the pics and asked.
I had a neighbor teen boy who came to my house to talk about plants. At first everything was OK, but then he appeared in my front yard every single time I went outside. It was getting so I couldn't go to my front yard. ( I knew he was like that because of his Aspergers, I'm putting it here because the situation sounds kinda freakier than it was and don't want to derail the convo with "Why didn't you do something about it?")
However, it was to the point that I didn't know how to handle the situation. I started avoiding the front yard. I didn't want to complain to his parents. Fortunately, he outgrew this stage.
I'm leaning towards something that started out friendly and something that escalated over time.
NG seems like a nice person and when you are celebrity's family you unfortunately need to be nice to people that you may not want to be nice to. But over time, if someone is visiting over and over you suddenly "aren't nice" anymore. It's when "you aren't nice anymore" is when things escalate.
Many people that show up in our lives are down on their luck or they have issues where their social interactions are different than our's (Substance abuse etc) They seem nice at first, but they can be overwhelming and when we push back on them they suddenly aren't so nice.
Perp may have not know she had money and saw Savannah's picture. She may have paid him cash here and there, but then he sees Savannah pics, he expects more from her. The relationship starts to sour etc....
All MOO....