I thought she was a Hybrid like her father. In "From a Cradle to a Grave", wasn't it sort of explained? Also, didn't Hayley need her blood to turn into a complete hybrid? That was how Hayley became a hybrid after she was killed she still had her babies blood in her, and that means her baby has to be a hybrid.
This excerpt from the wikia might explain.
Hope was conceived in the episode "Bring It On", and it was revealed
that Hayley was pregnant in "The Originals" and she was born in "From a
Cradle to a Grave". She is a Hybrid, and inherited her werewolf gene
from both of her parents while her vampire and witch legacy came from
her father who is the first Vampire-Werewolf Hybrid and the son of the
Original Witch. By her mother she even belongs to the werewolf
Also fans agree she is a hybrid as seen in this wikia posting.
As the world's first pureblood Hybrid, the extent and limits of Hope's
powers and abilities is unknown.
Hope has the blood of three species in her; vampire, witch, and
werewolf. Hope is an active witch because her blood is vampiric, but
she is not a vampire. It is unknown if activating her werewolf gene
will negate her witch abilities. Hope's blood makes her more resilient
than other witches. Hope could possibly practice magic on a higher
level than other witches.
In this source it talks about Hayley's baby but calls it the hybrid baby.
But the site was bustle.com, so you decide whether its canon or not.
Everyone thought Esther would control the witches from The Other Side
and force them to search for the hybrid baby, who was officially named
Hope Mikaelson on Tuesday night. But, apparently, she’s going to head
that search herself — and Hayley, Elijah, and Klaus have no idea
what’s coming for them.
This answer is basically sort of a comment, because I didn't have room in the comment box for it and it sort of answers the question, so sorry if it doesn't answer.
I think for a more definitive answer, you need to wait for them to tell you. I think the baby is going to have all of her father's powers, plus possibly witch powers, but Niklaus is not a witch so that possibility is not written in stone. I think the baby is definitely a hybrid, but if they decide to make her part-witch that may or may not happen, and you can't tell now. I never read all the books so you might want to read there as well, as that might help you.
As for being an original, if she has all the powers of her father that means that she can't be hurt by white oak.