  Microscopic calculations of neutrino-nucleus scattering cross sections are
critical for the success of the neutrino-oscillation program. In addition to
retaining nuclear correlations in the initial and final state of the reaction,
they are based on consistent nuclear interactions and transition current
operators, thereby enabling robust uncertainty quantification. In this work, we
address a significant limitation of these microscopic methods, which arises
from their nonrelativistic nature. By performing the calculations in a
reference frame that minimizes nucleon momenta and utilizing the so-called
``two-fragment'' model, we extend the applicability of Green's function Monte
Carlo calculations of neutrino-nucleus scattering to higher momenta than
currently possible. To validate this approach, we compare our theoretical
predictions against inclusive data measured by the MiniBooNE, T2K, and
MINER$\nu$A experiments.
