I think
Eloisa is very pretty (although I prefer
Eloise or
Aloisia). I think people would go with the pronunciation you said (eh-lo-EE-sa), because
Eloise and
Louisa are popular names and they're similar enough that people would assume that's how it's said.
I think
Danielle is kind of boring. I know a few, aged 20-30, and I really dislike the nickname
Dani.