In 2007, Didier Migaud, socialist deputy of Isère's 4th constituency, asked her to be his substitute during the legislative elections.
In 2010, she was elected Regional Councillor of Rhône-Alpes on the list led by Jean-Jack Queyranne.
Following the resignation of Didier Migaud, appointed head of the Court of Auditors by Nicolas Sarkozy on 23 February 2010, Battistel was chosen by the PS to be their candidate in the by-election for his successor.
Battistel is particularly opposed to the opening to competition of hydroelectric concessions; in 2018, Contexte indicated that "she seems to have convinced many of her novice counterparts on the subject".
[3] In 2023, Battistel publicly endorsed the re-election of the Socialist Party's chairman Olivier Faure.