Not sure how possible this would be but I suggest an alternate ending for the lioness form the player gets after completing Leonard's quest. Currently if you wait for rescue or play to the end of the game after getting it you get the generic feline girl ending. The only way to get the pride mother ending is to lose your mind to the infection. It'd be interesting to see what kind of ending would happen if you get out of the city in that form.
Maybe a little something about Leonard and the girls getting a place on the outskirts of a city and mentioning difficulties in acclimating to life outside the park. Or perhaps she goes into the city for a time alone and either returns to the park (or not, who knows?). Anyway just a suggestion.