If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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1. Please add the 'open_thread' tag.
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What draws her to environmental charities? Concern for animals? Concern for humans? Fighting global warming with its likely negative effects on both?
Before GiveWell/whoever can make a recommendation they need to know what the person wants. The best environmental charity for preventing species extinction is going to be very different than the best one for preventing animal suffering.
Good point! When I asked her earlier she said she wanted to save the rainforest to stop global warming, but I don't think she's completely inflexible about this.