EX Lup is a young M0-type variable star that undergoes intermittent accretion-driven outbursts. In 2008, it experienced the largest outburst ever recorded. Mid-infrared spectroscopic observations exhibit pronounced changes in dust emission features following this event. Literature studies interpreted these changes as evidence for the formation of crystalline dust grains in the inner disk and their subsequent transport to outer disk regions. In this work, we performed a homogeneous decomposition of the mid-infrared spectra with the goal of quantitatively constraining the mineralogical properties of dust grains and their temporal evolution. We found that the dust crystallinity peaked at ∼8% during the 2008 outburst, then gradually declined and returned to a quiescent level of ∼1%. This pattern of crystallinity variation is consistent with the scenario in which crystalline grains form in the inner disk during the outburst and are subsequently redistributed to larger disk radii. Moreover, the mid-infrared spectroscopic observations reveal that the flux ratio (F24/F8) between 24 and 8 μm exhibits a complex trend, and particularly reaches the smallest value during the 2008 event. We investigated the ratio F24/F8 as a function of time with self-consistent radiative transfer models. The modeling shows that the 2008 outburst caused the inner rim and inner disk regions (R  ≲  10 au) to expand vertically, and the observed trend in the ratio F24/F8 can be well interpreted as a variation in the scale height of the disk.