Okay...I have a couple of opinions.
From all the things that have been found from SP, I just get a very sad and pressured vibe. She seems like she tries so hard to be/sound/look perfect. Reading through the wedding blog just totally confirmed all of those feelings for me. The most used word in there was "perfect". It reads like a book, not like a portrait of someone's life. Combine that with the alter ego Pinterest board, and the comments by the SIL of her being "annoyingly" perfect or good mom (can't remember the exact wording and am at work so I can't re-watch the video.) It just seems like this woman was under a lot of pressure to be picture perfect.
Also from the wedding blog, it is weird that it all sounds like a first time marriage. I also noticed how she said she would be "blushing" during the family planning talk. I remember someone had posted a link to a page that had SP's name listed down as a donor to a "women's clinic" type place. This might be a long shot but maybe SP got pregnant out of wedlock? Is that why she "moved away" for awhile? Maybe this clinic helped her out, maybe she was forced to marry the father because of the Catholic belief system. Maybe it was all a big secret and no one knew about it. Maybe the ex has some unresolved issues with her?
I am not saying any of this to make her sound at fault, I am just trying to get a feel for where she was and had been mentally. Maybe she just had to leave, so she set it up with the half wrapped gift left out, the phone on the side of the road etc. I don't honestly know but the more crumbs we get about her the more I see this picture of IMO, a very unhappy woman doing everything she can to seem happy, and perfect etc.