I think
Louisa is gorgeous! Not too close to
Laura at all.
Louie is a cute nn-- it's fun. I think Lousie et al. are fine for nns, too. I'll also suggest
Lula and
Lilou as nns.
Louisa Emily is by far my favorite combo in that list! I think
Louisa Jennifer would be nice to use, and
Louisa Juliet is really pretty.
I have a big variety of names I like. The ones at the top that I'd actually use tend to be stronger feminine names. I am not prone to liking frilly names, but there are some that I enjoy.