+1 for a good multi-tool and a knife or three.
Training is very important since just carrying a knife is almost pointless if you do not know how to use it.
The biggest impact to her safety is her ability to blend into her surroundings if required. She should not dress out of local norms, or do anything that would get attention to herself, which includes going out with others that do not have the same mindset. Foreigners, specifically Americans, in different countries do not know how to act correctly because of the norms they have lived with and freedoms in the US. So when going abroad to study or otherwise, specific things need to not be done. She should take a few days when she gets there and people watch, see what girls her age are wearing, how they are acting in public and what is expected of her. Then she needs to act accordingly.
Aside from that (since that is mostly mental stuff) she needs to do the standard "safety" and situational awareness stuff. Not going home the same way. Not waking up at the same time every day, etc...
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