[name]Vanessa[/name] [name]Frances[/name] [name]Hall[/name]
[name]Isla[/name] [name]Frances[/name] [name]Hall[/name]
[name]Samantha[/name] ? [name]Hall[/name]
Any other ideas?
[name]Vanessa[/name] is my favorite from your three choices.
I want to say that [name]Vanessa[/name] [name]Frances[/name] is really “s” heavy but when I say it out loud it really seems to work well.
[name]Just[/name] in case your open to other middle names.
[name]Vanessa[/name] [name]Daphne[/name]
[name]Vanessa[/name] [name]Courtney[/name]
[name]Vanessa[/name] [name]Evelyn[/name]
[name]Vanessa[/name] [name]Josephine[/name]
[name]Vanessa[/name] [name]Juliet[/name]
[name]Vanessa[/name] [name]Julianne[/name]
[name]Vanessa[/name] [name]Marian[/name]
I think [name]Vanessa[/name] [name]Hall[/name] is very pretty and flows well.
If you like [name]Francis[/name] for a middle name go for it. It does sound pretty with all the “s” sounds.
[name]Isla[/name] [name]Frances[/name] is beautiful! [name]Samantha[/name] and [name]Vanessa[/name] are nice too, but a little dated.
I like [name]Isla[/name]. Growing up, I knew soooo many [name]Vanessa[/name]'s and [name]Samantha[/name]'s. [name]Isla[/name] seems so fresh!
I like [name]Isla[/name] but [name]Isla[/name] [name]Hall[/name] is a little hard for me to say. It’s very short, plus it’s vowel and L heavy. I agree about [name]Vanessa[/name] and [name]Samantha[/name] not sounding very fresh. With the ln [name]Hall[/name] it may be best to avoid names ending in A.
WDYT of [name]Aveline[/name] [name]Frances[/name] [name]Hall[/name]? It has both the sounds of [name]Vanessa[/name] and [name]Isla[/name].
[name]Vanessa[/name] [name]Hall[/name] is lovely
From your list, I like [name]Vanessa[/name] [name]Hall[/name], with [name]Isla[/name] [name]Hall[/name] in second (although I agree with the previous poster that [name]Isla[/name] [name]Hall[/name] is a bit difficult to say). [name]Vanessa[/name] is a bit 1980’s to me, but I love Shakespearean names.
More ideas:
[name]Anastasia[/name]
[name]Daphne[/name]
[name]Genevive[/name] (nn [name]Evie[/name]) (When I say it out loud, though, I’m not sure about it with your last name)
[name]Francesca[/name]
[name]Miranda[/name]
[name]Natasha[/name]
[name]Nerissa[/name]
[name]Penelope[/name]
[name]Rosalie[/name]
[name]Tabitha[/name] (not the best with your last name…)
[name]Vivienne[/name]
[name]Veronica[/name]
Good luck! 
I also like [name]Vanessa[/name] [name]Frances[/name] the most - I don’t think it’s as dated as [name]Samantha[/name]. I like [name]Isla[/name], but it’s so popular now, that it may be the [name]Samantha[/name] of your daughter’s generation.
I also particularly liked [name]Jill[/name]'s suggestions of [name]Vivian[/name], [name]Veronica[/name] and [name]Tabitha[/name], which have a similar feel to me.
I think that one [name]Vanessa[/name] here and there will stand out in the best possible way because it is a lovely name.
More suggestions
[name]Deidre[/name] [name]Hall[/name]
[name]Patricia[/name] [name]Hall[/name] I think that this name is beautiful much more so than [name]Margaret[/name] which is having a revival. I think it is sophisticated and elegant.
[name]Georgina[/name] [name]Hall[/name]
[name]Caroline[/name] [name]Hall[/name]
[name]Jacquelyn[/name] [name]Hall[/name]
[name]Lola[/name] [name]Hall[/name]
[name]Imogen[/name] [name]Hall[/name]
[name]Tamsin[/name] [name]Hall[/name]
[name]Sally[/name] [name]Hall[/name]
[name]Susannah[/name] [name]Hall[/name]
[name]Violet[/name] [name]Hall[/name]
[name]Daisy[/name] [name]Hall[/name]
[name]Maisie[/name] [name]Hall[/name]
[name]Rhoda[/name] [name]Hall[/name]
[name]Bronwen[/name] [name]Hall[/name]
[name]Larissa[/name] [name]Hall[/name]
[name]Elodie[/name] [name]Hall[/name]
[name]Vanessa[/name] [name]Frances[/name] [name]Hall[/name] - a classic, and I think the nn [name]Nessie[/name]/[name]Essie[/name] is very cute. This flows brilliantly!
[name]Isla[/name] [name]Frances[/name] [name]Hall[/name] - I adore [name]Isla[/name], but it is quite hard to say with [name]Hall[/name] …
[name]Samantha[/name] ? [name]Hall[/name] - I also love [name]Samantha[/name], but it doesn’t quite have the flow of [name]Vanessa[/name] with your surname.
So my vote is for [name]Vanessa[/name] [name]Frances[/name] (beautiful mn choice) [name]Hall[/name]!
I think [name]Isla[/name] [name]Frances[/name] [name]Hall[/name] flows the best. Good luck and keep us updated! 
love isla frances (-: