Not especially. Unlike her sister-in-law, she had no real career and was basically supported by her parents (or perhaps by the trust fund I'm sure they established for her) during the long years she dated Prince William. She was said to be working for the family company, but I suspect that was largely a dodge. Also unlike her sister-in-law, she wasn't really seriously involved with any charities or philanthropic/volunteer work either. She had something to do with a benefit for the Starlight Foundation, but I know of nothing else.
Her job now is being royal, and she's taken on a variety of charitable patronages, but these more or less came with her marriage. She didn't get involved with them independently of that. And of course her lifestyle is nothing anyone else can aspire to.
She seems a perfectly nice woman, from what I can tell (which isn't a lot), and she presents herself well, but no, she's hardly a role model.
She also dresses well, of course, as royal women tend to, but her style is rather staid and somewhat too old for her -- certainly for most young women.