"She has been here. She has been here for 5 hours this morning and more than 2 hours this evening," he added.
In contrast to Roca's statement, the prosecution lawyer for the Manos Limpias (clean hands) union, Victoria Lopez, told media the Princess Cristina and her lawyers had "decided not to answer the questions of the popular prosecution, which is a snub not only towards the popular prosecution but to the whole Spanish society."
The alleged use, or suspected abuse, of company funds to cover household expenses at the Barcelona home is among evidence Castro has compiled about Aizoon, the real estate and consulting firm Cristina co-owned with her husband Inaki Urdangarin.
The closed-door session, which lasted nearly seven hours, was a key step in determining whether she will be charged, but a final decision could take months.
The legal troubles of King Juan Carlos' youngest daughter have seriously damaged the Spanish monarchy's image at a time of 26 percent unemployment, outrage over political corruption, tax hikes and austerity.
