My older boy was not trustworthy to stay out of his crate for that length of time until he was about 3 years old. Our younger dog was okay out of her crate for 7-8 hours at about 18 months. Every dog has their own time frame for maturing. Yours is just saying that she's not ready yet. It doesn't mean she'll always need to be crated. I'd wait a few months and try again, starting with much shorter periods of time alone out of her crate to see if she's ready yet. Some will seem okay for a few weeks and then have an unsuccessful day. It's frustrating but rushing things usually doesn't get better results. Give her a little time and hopefully she'll be one of those early maturers.
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