You guyz have never encountered the hard-core fish-keeping set, obviously.
The folks who have entire rooms dedicated to their tropical fish. Many, many tanks, and of exotic ones. They will do some amazing things. (I am guilty of being ready to pay up to £500 to fly the little fins home, if only there was a way to do it, which there isn't. So I can't be making fun of those folks who spend thousands on their tanks.)
She is doing this as a kindness to us, to rehome our guys. They are not particularly monetarily valuable fish, although they can live 20 years and are breeding like mad. (So she could make some money selling them, if she had the inclination.) She is driving up on a Friday, spending the night in a hotel, and leaving early the next morning to go back home again.
I have told her that I would help with gas. I just need to know what a reasonable amount is. The Daughter says cars here get really good gas mileage. But she's saying like 50mpg, which I can't quite believe. I just want to know if you think £150 would cover her fuel.
And yes, I'd be very disappointed if she doesn't show up.