What is the law regarding billing for past services?

Question Details: I started my own landscaping business last spring. In the beginning I was working with a potential client about a landscaping project for her new home. I met with her several times, gave her several revised estimates, as well as designed blueprints and spent nearly 20 hours of my time working with her. She ended up not doing any business with us. I advertised free estimates but not CAD designs or consulting, however in an interest to build a good reputation and relationships I chose not to send her a bill.She is now harassing me about money I "owe" her in an unrelated issue. Her case is not valid and she is threatening to take me to small claims court. Can I now bill her for all the time and design work I did for her?

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