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It depends what exactly is she into. For electronics you can check out arduino. They sell full kits with everything you need - some components like leds, breadboard so you can create circuits without soldering and a small 8bit computer to control everything with. AFAIK they also sell kits specifically for education starting with middle school.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.