The emergence of collective motion is a key self-organization phenomenon in non-equilibrium active matter. For rod-like particles, when the propulsion direction is perpendicular to the long axis, velocity alignment becomes dynamically difficult, and the underlying mechanisms remain largely unexplored. Here, we study an ellipsoidal Quincke roller system propelled along the short axis (perpendicular to the long axis). We show that, under high-frequency periodic electric fields, the particles can align their velocities through flipping and rotation, and form large-scale, stable macroscopic vortices. The high-frequency driving maintains directional propulsion while reducing particle activity and suppressing chiral precession. In this regime, particles can switch between the parallel spinless state and the spinning transversal state, enabling orientation adjustment via flipping. The periodic switching-off of the electric field allows unrelaxed dipolar interactions to reorient particle dipoles, leading to local alignment of propulsion directions. Meanwhile, the interruption of the field suppresses the accumulation of chiral precession, enhancing the stability of collective motion. Our results reveal a distinct alignment mechanism in transversely driven active systems and provide a model system to explore defect dynamics in nematic phases under non-collinear driving.