Girls, Inc. of San Diego County. It is an affiliate of the national Girls Inc. organization, which is one of the oldest, if not the oldest, organization in the US serving the needs of underprivileged girls. (Founded in the 1860s, used to be called Girls Clubs). The programming for this affiliate is currently provided in Oceanside, Vista and Escondido. Here is the website:
They have (among others) a program called Girls Inc. Operation SMART, which addresses STEM education and another program called Girls Inc. Media Literacy, which fosters a critical perspective on information available on the internet.
If you are interested in helping, PM me and I can connect you to the Executive Director.
PS The immediate past president of the Board of Trustees is the Associate Superintendent of the San Dieguito Union High School District.