Maeve - lovely name. I really like it and Mavis but they don't go with our surname
Sidonie - I think most people will automatically pronounce it like Sydney so you and DD will spend alot of time correcting people. It's pretty but it depends if that will bother you, I know it would bother me. It's also a bit similar sounding to Elodie
Florianne - beautiful, my favourite from your list. It's so underused but so beautiful.
Cressida - it's ok just not my style. You could call her Sid for short
Hermione - I really like it but doubt you'll be able to avoid HP references. It was actually on my list for DD but I couldn't get part the UP thing and I don't even like HP (maybe if I did I wouldnt mind do much)
Romilly - pretty but I much prefer others on your list
Eloise - I actually think Elodie and Eloise work as they have completely different endings. Whereas Elodie and Sidonie sound too similar to me because they end the same.
Ophelia - a bit too frilly for me
Clara - love it
Anya - I like that you can get Annie from it but I prefer other Ann names (Anna, Anneliese, Annabel)
Amara - dislike
I would choose Elodie and Florianne or Elodie and Clara