Deputies from the Jurupa Valley Station responded to the 7700 block of Mission Boulevard, Glen Avon.
Deputies say they found 27-year-old Sandra Sigala and her 16-year-old boyfriend arguing.
Upon further investigation, they discovered Sigala had engaged in sexual acts with the 16-year-old male victim earlier in the evening.
Sigala was placed under arrest.
The charges include possession and distribution of child pornography, unlawful sexual intercourse, and a lewd act on a child.
The investigation continues. Anyone with additional information is asked to contact the Jurupa Valley Station at (951) 955-2600.