Can you help me find the name of a science fiction novel?

Question

It was about a girl who survives a disaster alone. I think her name is Cassandra. Her family has a completely equipped survival shelter in the basement of their house, and she makes it into that shelter. She is exceptionally intelligent. The shelter is filled with books and anything else she would need to survive.

I thought it was by David Brin, but have not been able to find it. I would appreciate any help you can give me, the name of the book or a site that might help me find it.

Answer 1

I don't know if this is what you are looking for, but is the name of the novel..Z for Zachariah? It is by Robert O’Brien. I really hope this is what you were looking for!! :)
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This is one of the reviews from the 2nd. link. --

Publisher's Weekly, January 20th, 1975, p.77

The late author of this suspenseful novel won a Newbery Award for "Mrs. Frisby and the Rats of NIMH." Told in diary form by a 16-year-old girl, O'Brien's posthumous story is set in the future, after a nuclear war. Ann Burden believes she is the last person on earth. Her family has left her to look after their farm in a deep valley as they drive off to look for other survivors. They never return. One day, Ann sees the smoke from a campfire and watches as it comes closer. The reader is at first relieved but gradually frightened, like the heroine, as she finds that the man who arrives at her home is no friend but a deadly enemy. The private war between the two is graphically described in a novel which is exciting and thought-provoking.
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Added.............
Maybe this is the book you are looking for.........

EMERGENCE by David Palmer......I actually did a silly thing and contacted David Brin through e-mail and this is the title and author he said that it might be. I don't have a link to go with this one though.

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I found a review of this book ......

Review Summary of Emergence
Eleven-year-old Candy Foster-Smith is a genius, a prodigy, and due to her unauthorized exploration of the family bomb shelter, possibly the only survivor of a Russian bioweapon attack (note: published 1984). Upon emergence from the shelter, Candy finds evidence that she represents another form of emergence--that of a new species, Homo post hominem, consisting of the best and brightest as well as the most dangerous malcontents, but all possessing a natural immunity to most human disease, and therefore likely to have survived the biowar. With only her hyacinth macaw, Terry, for company, and armed with only her karate black belt, Candy sets off across the country to find others. Her journey leads her from the depths of loneliness, through soaring (literally) adventure, and ultimately to a decision point: when is it necessary to kill--or to die--for those one loves, and for those one has never even met? Told in the form of journal entries, the book's abbreviated, yet surprisingly rich, writing style takes some getting used to, but is well worth it.
Joy F., Resident Scholar

Answer 2

need more info, or search on google.