  Recently, we studied the chemical evolution of lithium in the thin disc of
the Milky Way. We found that the best agreement with the observed Li abundances
in the thin disc is obtained considering novae as the main source of lithium.
We assumed a delay time of ~1 Gyr for nova production and an effective 7Li
yield of 1.8($\pm$0.6)x10$^{-5}$ Msun over the whole nova lifetime. The
possibility to check our detailed assumptions on lithium production on other
stellar systems, such as the satellites of our Milky Way, is seriously hampered
by their distance from us. In these systems dwarf stars (where the original
lithium can be measured) are too faint to detect lithium lines. However, thanks
to the Gaia mission, it was recently possible to disentangle the stars of a
disrupted dwarf galaxy in the Galactic halo (called Enceladus or Galactic
sausage). Adopting a chemical evolution model tuned to match the metallicity
distribution function of Enceladus stars, we present our predictions for the
lithium abundance of the stars of this disrupted galaxy.
