I agree, I love her evolution along the story, I think that I would be able to read a manga where she is the main character. Currently I ask to myself how will be developed her relationship with Guts and Caska when the latter will gain again her self and memory back.
I love Berserk, Farnese and Serpico are my favourite characters. Serpico's wind sword is basically the coolest the ever, and Farnese did a good job a looking after Caska
Nice to see another fan of Berserk and of the "Snow & Flame" duo, I like very much Serpico me too =)
Farnese's development is great with Caska but I can't blame too much Guts, as stated by Luka, to love and being able to take care of someone are things very different, Guts wasn't just the right man at all for doing the second thing, overall considering the curse matter attracting evil spirits.
However I'm not sure of the developments of Farnese, she has strong ties and feelings toward Guts and Caska, but at the same time they are even opposite between them.
This could be even the beginning of something from bad consequences according to how Caska will react to everything when she will be again herself: I hope not because Farnese suffered already enough in her life, but sadly she seems fated to be a tragic character imo.