She had the ECG above recorded.
There are large R-waves in the right precordium (V1-V3) and a deep S-wave in lead I. This is diagnostic of right ventricular hypertrophy.
She was admitted to the hospital and found on echo and right sided catheterization to have significant right ventricular hypertrophy, pulmonary hypertension with pulm art pressures of 80/26, and a patent foramen ovale with some right to left shunting.
The likely diagnosis is primary pulmonary hypertension.
She had been seen in an emergency department after the first syncopal event, but this was apparently missed.