Gender equity is a critical agenda for Science, Technology, Engineering and Mathematics (STEM) education to increase women involvement in the STEM pathway. Our study is about the impact of a project in which all-girl teams participated to an educational robotics program. We used quantitative and qualitative data to determine the impact and understand the girls' program experiences. After the participation of the program, the mean scores have increased in interest in STEM, interest in STEM careers, STEM identity, and understanding of STEM scales. The groups underlined their problem solving and group work experiences, as well as their excitement and motivation related with the STEM activities.