"Mere suspicions or conjectures are not valid elements for an indictment," the prosecutor's office argued, according to the court in Mallorca which is leading the investigation.
The case, opened at the end of 2011, centres on allegations that Cristina's husband Inaki Urdangarin and his former business partner Diego Torres embezzled six million euros (USD 8 million) in public funds.
The money was allegedly placed in the non-profit Noos Institute, which Urdangarin chaired from 2004 to 2006 and of which Cristina was a board member, for it to organise sports events.
Cristina, 48, a manager in the social programmes foundation of the Catalan finance group CaixaBank, moved to Geneva in August with her four children, where she will work on the firm's joint projects with UN institutions. Her husband is living in in Barcelona.