Does a contractor legally have to provide their wholesale invoices to a customer?

Question Details: I have a customer who wrote me a check for a remodel job at 5 in the afternoon, however the next morning they put a stop payment on it. This was because I would not give her my invoices as to where I bought my materials. The job was done at my retail prices and labor not wholesale. They are the prices I charge and she is trying to say that overcharged for hours but she is only looking at hours on-site, not work done for the project at my home as well was travel time and time to get materials which are also billable hours also. Now she is suing me for the amount of the check that she stopped payment o, which is $1800. Does premeditated writing a check to pay for a remodel job then stopping payment on that check the next day constitute theft of services by fraud?

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