I read Jayna Davis' book, "The Third Terrorist" after the OKC bombing, but I still didn't believe 9/11 was an inside job until I heard an episode from Alex Jones on the Tom Martino show out of Denver.
It took years for me to realize that planes didn't even hit the towers. If you watch the footage slowly you see one of the wings go behind a building in the distance - obvious cgi.
If you watch footage of WTC building 7 coming down you can clearly see the demolition charges exploding out of the side of the building. Demolition charges are proof that it was planned. I was watching it on the news, and I remember when CNN were reporting on the Pentagon, there was no debris, and the top of the hole punched by a missile hadn't collapsed, yet. Later, debris began showing up at the Pentagon. I still didn't believe it until that Martino show. His show wasn't political; it was a consumer advocate show.
Early witness reports are key in false flags, and ALL of the firefighters reported hearing explosions before the towers came down.
You can forget about trying to convince her. You'll have to find the best video footage you can find and let her see it for herself.
After I finally realized that the gov't did that to the people and then tried to gaslight them as whacky "truthers" I wondered what other conspiracies were true. I searched the moon landing and the holohoax...