Hello, and thanks for your question.
From your description, it sounds like your traveling guest may have an AB 60 driver's license. Not all TSA security screeners accept this as a valid form of identification. If your friend has a valid passport, that might be a better form of identification that will definitely be accepted. Here is more information from:
Scroll down to: "Can I use an AB 60 license to board an airplane?"
"We recommend NOT using an AB 60 license to board an airplane. There are two risks. First, the Transportation Security Administration (TSA) is a federal agency and might not accept it. The TSA has been inconsistent regarding the acceptance of AB 60 licenses (or similar licenses from other states). Second, and more importantly, TSA officials could use the license as a basis to stop someone, question that person, and ultimately refer the person to Immigration & Customs Enforcement (ICE). AB 60 does not protect against discrimination by TSA officials, and the concern is that TSA agents may use an AB 60 license to flag people and refer them to ICE. If a person needs to fly, she should use other identity documents, such as an unexpired passport, and be aware that TSA engages in immigration enforcement."
I hope this helps.
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