Sometimes it's not.
Themyscira: This is about Garth. Next time don't waste so much energy deflecting. Atlantians are highly skilled warriors and troublemakers. Clearly Garth's been blessed with other noble attributes.
Donna: So, you've been following me?
Themyscira: Surely you don't think I let you run around with your friends without keeping tabs. By the way, the next time you need a good birthday cake, I recommend Tartine on the mission. They have a divine deux cross.
Donna: Hmm, since you know everything, I'll just shut up.
Themyscira: Quite the contrary. You asked for more time here, I granted it. You still have six months left. Whether you want to use it or not, that's your choice.
Donna: Sometimes it's not.