Jennifer produced independent feature The Lake Effect, written and directed by Tara Miele, starring Ross Partridge, Tara Summers and Kay Panabaker. The film had its international premiere at the 2010 Raindance Film Festival and won best feature and the audience award at the Moondance Film Festival. It can next be seen at the Phoenix film festival before heading into distribution in 2011.

Jennifer has produced several short films including The Dawn Chorus, written and directed by Hope Dickson Leach, which played film festivals including Sundance and London, and won Best Student Narrative Short at the Austin Film Festival. She also produced Twenty Dollar Drinks, a short starring Sandra Bernhard and Cady Huffman, which premiered at the 2006 Tribeca Film Festival.

She served as the line producer on independent features Ten Stories Tall, starring Ally Sheedy and Josh Hamilton, and Dear Lemon Lima, featuring Melissa Leo, Beth Grant and Meaghan Jette Martin. She was an associate producer on Indelible, a feature that won the Sloan Foundation Production Grant.

Jennifer founded her own production company, Covert Productions, and has several projects in development. She participated in the Film Independent Producers Lab and the Berlinale Talent Project Market.

Westin was a finalist for the PGA Debra Hill Fellowship and won the Arthur Krim Memorial Award for excellence in producing. She has a BA in theatre from the University of Southern California and an MFA in film from Columbia University.