Princess Marie Gabrielle, née Duchess in Bavaria, has never been Crownprincess of Bavaria. In 1912, the year of Marie Gabrielle's death, Rupprecht was "only" Prince of Bavaria.
And as far as I know, his wives had nicknames: Marita and Jenke (Marie Eugenie?).
I found some nice pics of Albrecht in "Die Wittelsbacher und ihre Hunde" ("... and their dogs"). It looks like Albrecht had dogs around him for all his life. For example he had dachshunds called Uschi, Tupfi, Radi, Amsel and Bartl.