  We study the low corona evolution of the `Cartwheel' coronal mass ejection
(CME; 2008-04-09) by reconstructing its 3D path and modeling it with
magneto-hydrodynamic simulations. This event exhibits a double-deflection that
has been reported and analyzed in previous works but whose underlying cause
remained unclear. The `Cartwheel CME' travels toward a coronal hole (CH) and
against the magnetic gradients. Using a high-cadence, full trajectory
reconstruction, we accurately determine the location of the magnetic flux rope
(MFR) and, consequently, the magnetic environment in which it is immersed. We
find a pseudostreamer (PS) structure whose null point may be responsible for
the complex evolution of the MFR at the initial phase. From the pre-eruptive
magnetic field reconstruction, we estimate the dynamic forces acting on the MFR
and provide a new physical insight on the motion exhibited by the 2008-04-09
event. By setting up a similar magnetic configuration in a 2.5D numerical
simulation we are able to reproduce the observed behavior, confirming the
importance of the PS null point. We find that the magnetic forces directed
toward the null point cause the first deflection, directing the MFR towards the
CH. Later, the magnetic pressure gradient of the CH produces the reversal
motion of the MFR.
