Included as candidate number 26 on the Podemos list for the 2015 Madrid Assembly election led by José Manuel López, she was elected deputy of the 10th term of the regional legislature, joining the Parliamentary Group of Podemos Community of Madrid. At that time, she narrowly entered the Assembly (26th out of 27 elected legislators of Podemos); she conditioned the assumption of the seat to being able to continue exercising her medical profession part-time. In December 2017, by virtue of a reshuffle of the parliamentary group, García became the president of the parliamentary group replacing Marco Candela. At that time, she also joined the Coordination Council of Podemos Comunidad de Madrid.