I have been pondering your post all day, and I really don't know what to suggest
If it's self help book suggestions, it would really have to be one that your friend is drawn to herself. There are so many titles out there, it's tricky thinking of suggestions. Perhaps popping onto a site like amazon and actually searching for 'confidence building', or 'how to stop crying' and seeing what comes up - you never know, one or two may be the perfect read.
Alternatively, I have often found confidence or been inspired from reading fiction. Great stories can change how we feel about ourselves, our lives and our futures. But again, it is difficult to know what to suggest as what lifts one reader could be a real downer to another.
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It's good that she has a friend who is trying to help without judging her. Good luck to you both.