[name_f]Rosette[/name_f], [name_f]Primrose[/name_f], and [name_f]Rosalie[/name_f] are all great choices!
There are a lot of great suggestions above. A few I would add are:
[name_f]Rosamund[/name_f] / [name_f]Rosamond[/name_f]
[name_f]Rosetta[/name_f]
[name_f]Roselyn[/name_f] / [name_f]Rosalyn[/name_f]
[name_f]Rosalba[/name_f]
[name_f]Rosemary[/name_f]
[name_f]Rosanna[/name_f]
[name_f]Rosalia[/name_f]