Translation:E hele, e Kaʻiulani.
There are two different "E" in this sentence: the one before "hele" indicates a command or suggestion; this sentence isn't saying that Ka'iulani is actually going or went or will go, but asking her to go. The second one you use before somebody's name (or an epithet describing them) when you are calling them. Kind of like the "hey" or "yo" in "Hey/yo, Ka'iulani, won't you go." And we also saw "Aloha, e ke keiki" (not a name, but you're still addressing the child) to mean "Hello, child".
I read someone's comment on another discussion and the e before a name is used to address the person. An o before a name is talking about the person so; Aloha, e Ka'iulani (e to address Ka'iulani) but if you were saying 'oh I saw Ka'iulani the other day' you'd say o Ka'iulani. I hope this helps!
E is used before an action to signify a command or a suggestion. When you say, "E hele", you're telling someone to "Go!"
E is used before a noun (usually a person) to indicate that the person is being addressed.
Ex. Mahalo, e Kawika. ➜ You are saying thanks to Kawika.
the above are from, tips/notes, on this site https://www.duolingo.com/skill/hw/Sounds/tips-and-notes