That is odd and I might have to look into it.I'm stuck trying to get Nimhe to let me take her for walkies on The Dome. I've taken Seraphine on walkies at least 10 times now, even stuck around to take her on consecutive walkies (I know it's Ponygirl walks, but walkies are more fun to say). Do I have to make ponygirl bets and/or talk with everyone for them to count towards the required amount before Nimhe gets jealous and asks for her own walkies on The Dome?
The event should trigger already after the second time. When you return with seraphine then you'll get an event in the cargo Bay with Nimhe and from then on you can take her to walks as well.