  We investigate the effect of chiral mixing on dilepton production by
combining the in-medium spectral function in the chiral effective field theory
with the state-of-the-art fluid dynamical simulations. We compare the spectral
functions with different chiral symmetry restoration scenarios. We find that
the scenario with proper chiral symmetry restoration that takes into account
the degenerate $\rho$ and $a_1$ mesons leads to an increase of the yield in the
window of $1.1<M<1.4$ GeV. Whereas, the low-temperature theorem of chiral
mixing extrapolated toward a chiral crossover, often used in the literature,
leads to a substantial overestimate at $M=1.2$ GeV.
