I guess you should try to avoid "noun" names, like flower names and all (though they're not that bad; Lily Fisher would be cute, or even Lily-Rose Fisher).
Amelia Fisher, Elizabeth/Elisabeth Fisher, Gwendolen (Gwen) Fisher, Charlotte Fisher, Megan Fisher, Hannah Fisher, Susannah Fisher (Sunny), Kate Fisher, Matilda Fisher, Laurel (Laurie) Fisher, Elinor Fisher, Natalie Fisher, Catarina Fisher, Isadora Fisher, Nicola or Nicolette Fisher, Miranda (Mandy) Fisher, Georgina (Ginny) Fisher, Sophie Fisher, Delia Fisher, Ella Fisher (or as a nickname for Elizabeth), Penelope Fisher, Sabina Fisher, Alexandrina Fisher, Alix Fisher, Lucy Fisher, Keira Fisher, Sophie Fisher, etc.
So tons and tons of names would sound great with Fisher as her last name. Try www.nymbler.com too if you're unsure where to start; that website is great and you can just type in random names you already like (including boys names) and it'll give you suggestions of a similar style.
Good luck and congrats!!