What do you think - could [name]Sara[/name] work as a nn for [name]Sabrina[/name]?
I think it is a bit much, and I prefer [name]Sara[/name] alone personally. You could use [name]Sabra[/name]…
I honestly thing that [name]Sara[/name] is too much of a stretch to [name]Sabrina[/name]. I have a friend named [name]Sabrina[/name]. She says she loves her name but the no easy nn thing makes it annoying sometimes (I personally love it 
Sometimes, her friends call her [name]Saby[/name] but mostly she’s just [name]Sabrina[/name], which is beautiful on it’s own.