Angela was born on February 27, 1988, in New Jersey to Phillip Price and Emily Moss, but Emily refused to be with Phillip, instead choosing to marry Donald Moss, who became her adopted father. She is an only child. Her mother died as a result of the Washington Township leak of 1993. In the aftermath, she became friends with Darlene and Elliot Alderson, with whom she shared a love for the book From the Mixed-Up Files of Mrs. Basil E. Frankweiler. Angela fondly remembers wanting to be like Claudia Kincaid, the story's adventurous heroine. She also remembers the Aldersons subjecting her to their favorite movie, The Careful Massacre of the Bourgeoisie, every Halloween.

Angela attended college, for which she is thousands of dollars in debt. She was employed by Allsafe Cybersecurity as an account executive in charge of E Corp's security contract. In late 2014, she recommended Elliot to her boss Gideon Goddard.

She has stated that she occasionally smokes weed with Elliot. At the start of 2015, she lives with her boyfriend Ollie Parker in New York City. She personally has a MacBook and uses OS X. She is an avid jogger.