  Using Jeans modelling, we calculate the velocity dispersion profile of the
ultra-diffuse galaxy (UDG) Dragonfly 44 in MOND. For the nominal mass-to-light
ratio from the literature and an isotropic profile, the agreement with the data
is excellent near the center of the galaxy. However, in modified gravity, close
to the cluster core, the gravitational environment should bring the galaxy back
towards the Newtonian behavior. This success of the isolated MOND prediction
for the central velocity dispersion could then mean that the galaxy is at large
distances ($\gg5$ Mpc) from the cluster core, as hinted by the fact that
close-by UDGs share similar velocities with a dispersion well below that of the
cluster itself. There is however a two-sigma tension in the outer part of the
UDG due to an increase of the observed dispersion profile with respect to the
flat MOND prediction. This deviation could simply be a measurement error. Other
possibilities could be, for a UDG far from the cluster, a higher-than-nominal
baryonic mass with a tangentially anisotropic dispersion profile, or even a
sign of a dark baryonic halo. If the UDG is closer to the cluster core, the
deviation could be a sign that it is in the process of disruption.
