I like
Ernesta too. Thing is, Ernestina/Ernestine would be honouring; while I'm usually rather lenient when it comes to using the exact same name or just a variant of said name for honouring purposes, it's somehow different in this case and I really want to use either
Ernestina or
Ernestine.
I'm just a little worried that this name might be too cumbersome for a girl in this day and age.