Muslim convert Lorna Moore, 34, was accused of planning to take her three young children to the war zone - including an 11-month-old baby.
Around the same time, a number of pregnant women from the same community were poised to give birth in the Caliphate.
Following an Old Bailey trial, Moore, from Walsall, West Midlands, was found guilty of failing to tell authorities her husband Sajid Aslam, 34, was about to leave for Syria.
The jury also convicted Ayman Shaukat, 28, of preparing terrorist acts by helping Aslam and Muslim convert Alex Nash, 22, on their way.
The pair will be sentenced later alongside Nash and Kerry Thomason, 24, who was pregnant when she was stopped from flying out with her two children to join her husband in Syria.
