If I was going, I'd be taking my trusty ST300, but that's more weight then most women are willing to carry.
You indicated that your friend is not familiar with multitools, survival techniques, and mechanical repair. She has probably never used a multitool before. My suggestion is to keep it simple and straightforward. Go with the Rebar or a Juice instead of the Wave, and skip fixed blades and dedicated folders.I assume since you are asking in the Leatherman forum, you would prefer to recommend a Leatherman. My personal preference would be for an SAK, either the Fieldmaster or Hiker for a primary tool and a Vic Midnight Manager as a backup.I don't know for certain, but based on Leatherman's high price in Europe, I'm guessing they are very expensive or unavailable in Africa. Victorinox is available almost everywhere and I believe it is usually the cheapest quality blade/tool available. This may make replacement easier and could also mean thieves may be slightly less inclined to try to steal her tools.Let us know what you recommend and please share any tool stories she passes along over the next two years.
As a Peace Corps science teacher in the Western Samoa village some time ago, I claim some expertise in improvising things in the Third World. I will not mention a specific multitool, though I wish these had been commonly available when I went there in the 1970s.Multitool and Swiss Army knife are essential. Let me suggest that you look for one that has a good selection of screwdriver blades and a file. A serrated blade can be useful for cutting plastic pipe and other uses.A selection of screwdriver bits is very useful. Local hardware stores can probably provide screwdriver handles with replaceable bits - look for magnetized bits that will not fall out.A small locking plier (ViseGrip) can be very useful as an improvised work bench. I also recommend small pocket flashlights with the most commonly available dry cells. I always s carry a Mini Maglite that uses AAA cells. Be sure you have extra bulbs. A good, sturdy fixed blade knife may be useful if you are allowed to bring it in to the country. A stainless Mora might be a good choice.Excellent for use in the village and very good gifts will be inexpensive stainless steel boy scout knives. I gave a MIL-K military surplus pocketknife to a friend that was very much appreciated. There are some inexpensive copies of these (knife blade, can opener, bottle cap lifter, awl) that seem good.Even if you don't smoke, you should bring a cigarette lighter for starting fires. Modern fire sparking rods are extremely useful if matches and lighters get wet.
The knowledge of how to use a multi-tool is a lot more important then the tool itself in my opinion. If you want her to be as prepared as possible then you should set up a little multi-tool bootcamp. Set up a series of situations and have her use the multi-tool on them. Cutting branches, prying open cans, cutting rope, loosening bolts, etc. Then show her how to maintain the tool, clean it off after every use, oil the joints, etc.As for the tool itself, I would pick a Spirit. She won't have to worry about adjusting anything, and it will be more resistant to rust and grime. Throw a 91mm SAK and a 4" fixed blade and that's a pretty good start.