Returned iPhone to Best Buy. Got another one from Apple. New new phone charges in 3 hours. Great success.
My hometown is very close to the Nepalese border. My mom and sister were just there and were surprised at the saturation of iPhones in the area - in the most remote parts. While it is an object of desire, I don't think it is any more coveted than anywhere I have been in the US. That being said, if your phone is lost, at least there are things you can do to try to recover it. The police may or may not take your case seriously. In India/Nepal, especially for a foreign national, the chances are slim to none. From what my family members have mentioned, the speeds available there making using the iPhone an exercise in frustration. Sure you can use it but 3G/4G/LTE speeds are not available or the bandwidth is very low. Depending on where she goes to in Nepal or Jordan, she might barely have cell tower reception, let along service for the internet over a mobile device. However, since they made a case for not bringing an iPhone but an android device being fine, it seems she won't stray too far from densely populated areas. The whole practice of putting ones phone in the back pocket is asking for trouble regardless of which phone it is. My cousins use theirs freely but they are also slightly more aware of the dangers of losing their phone/it getting stolen (no more cell phone). It is still a luxury item in that part of the world and the Apple brand name means a lot more than perhaps Samsung (or any other Android phone) does, thereby carrying a lesser resale value on the black market. Pick pockets won't risk getting caught lifting a phone they can't profit as much from.
What exactly is she planning on using her phone for? Just making calls? Internet access? Facebook? It might be less expensive overall to just get a local phone and add money to it as and when she needs it. Might be slightly more cumbersome but she has her iPhone in case of an emergency and the other dumb phone locally sourced for local calls. I am heading back there this summer on a medical mission trip and will be in some rural parts of Nepal and India for a few weeks assuming everything goes well with my research advisor. Don't plan on taking my iPhone with me. Will just get a phone there - waaaaay cheaper than paying for international access from the US.
I can't speak to how things are in Jordan/Chile but if she needs to be more careful of her belongings whilst in public transit in Nepal than out and about. Theft can occur anywhere but with foreigners, trains/buses/rickshaws seem to be a lot more common because they are really an assault on the senses. So while she might think her phone is safe in her bag and was never in anyone's view, the bag itself could get swiped. On trains in the region, they have iron chains that you can lock your luggage to as it is unfortunately a common occurrence.
I hope this doesn't reduce your or her enthusiasm for the upcoming trip but I do think her being aware of all the shitty things that could happen would keep her a tad more aware of her surroundings and hopefully keep the trip free of any mishaps.
PS. Tight jeans are usually a bad idea - the silhouette of the phone is visible even if the phone is entirely out of view. Makes for an easy target.