She knew she couldn't win in her own right in 2019 (although even Pichetto admitted after the PASO that she might be regretting that judgement so far ahead was Frente de Todos). Regardless, she also had every reason to believe that the next government would not last the four years, which was another reason to put up a frontman, and for her to be the next in line. Throughout her government Alberto made no secret of what he really thought of her. It must be delicious for her to now to able return the compliments, either directly, or through third parties.