I think Fiona was completely honest on
this page. I also think that until now she had no idea Sara is into girls. She may be not too quick on the uptake, but it's impossible to miss that Sara is nervous about telling Fiona that she likes women. The way I'm reading it, Fiona thinks Sara is afraid to be discriminated by Fiona, so she mentions what the lesbian who is closest to her does before going on a date, to show that she's used to the idea of women dating women. Sara doesn't get it, so Fiona explains what she means.
I'm afraid Fiona is so what-you-see-is-what-you-get there isn't much to analyze about her. Note she's talking with her mouth full: endearingly unelegant, but literally not hiding anything could be a hint that she's not hiding anything.
Artemisia: if we cannot sympathize or understand then all we claim to be as human beings is just marsh gas
Valerie: Lia knows how to turn that frown upside-down.
