  We investigate a scenario inspired by natural supersymmetry, where neutrino
data is explained within a low-scale seesaw scenario. For this the Minimal
Supersymmetric Standard Model is extended by adding light right-handed
neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the
lightest neutralinos to be higgsino-like. We first update a previous analysis
and assess to which extent does existing LHC data constrain the allowed slepton
masses. Here we find scenarios where sleptons with masses as low as 175 GeV are
consistent with existing data. However, we also show that the up-coming run
will either discover or rule out sleptons with masses of 300 GeV, even for
these challenging scenarios.
  We then take a scenario which is on the borderline of observability of the
upcoming LHC run assuming a luminosity of 300 fb$^{-1}$. We demonstrate that a
prospective international $e^+ e^-$ linear collider with a center of mass
energy of 1 TeV will be able to discover sleptons in scenarios which are
difficult for the LHC. Moreover, we also show that a measurement of the
spectrum will be possible within 1-3 per-cent accuracy.
