You could probably get away with not getting a lace front even though her hairline shows if you are clever enough with the styling.
Her hair color has varied so much in everyone's interpretation...
I don't think she was ever in color officially either. Joker, Beast and Snake, yes but... not Wendy or Peter.
Personally I would get a shorter wig that I could pull back, stub it and make the buns separately. That way they could be neater and you can make them as poofy as wanted. I think she has two buns as well, if I remember correctly. There are a number of ways you could go about it, but the easiest would probably be working around a base in the shape you want and finding a way to attach them cleanly to the wig. Also!
I have always seen her crown as made of thick wire.
Something similar to this:
I really love all the Noah's Ark characters way too much though <3