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One approach is to write separate chapters (maybe alternating, but maybe in this case more from her?) with the writer identified at the beginning of each. A similar approach was taken in the Jumpe...
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#2: Initial revision
One approach is to write separate chapters (maybe alternating, but maybe in this case more from her?) with the writer identified at the beginning of each. A similar approach was taken in the _Jumper_ novels by Stephen Gould; each chapter is "titled" with the name of the point-of-view character for that chapter. I once read a novel, I think by Spider Robinson but I might be mistaken, where two characters alternated chapters in first person; that would be similar to what you're describing. In both of these cases the change in point of view didn't impede the story; that's really important. What you talk about in one of your chapters should follow naturally from whatever she talked about in the one right before it. Don't jump around; that'll confuse your readers. (Consider how confusing it is to read a comment thread where people posted out of order. You don't want to cause that kind of reaction in your readers.) Remember, as the two of you plan this, that not all chapters need to be of equal length and you don't need equal numbers. If it seems more natural for her to have more of the text, do that. If it ends up being closer to 50-50, consider alternating.