If this was the first time Gana had babies then this might shed light on why she rejected her baby..
*primiparous: having given birth for the first timeThe primiparous mother is usually young. In captivity she has had no
opportunity to see mothering, so that immediate rejection of the baby is usual
following the discomfort of birth, or she may not permit adequate breast feeding,
necessitating separation in a few days..... The rate of maternal rejection and ‘baby battering’ is very high in primiparous
Maybe she just wasn't well-prepared to care for both babies and chose one over the other. Who knows? Sucks that she had two and now has none...