Are you serious? I don't remember it being mentioned, but there's no way they didn't write to each other, right? She wouldn't leave poor Ethan all alone without so sort of support.
I might be remembering wrong (in which case just ignore me, lol) but wasn't there a few chapters ago some scene of her wanting to write him a letter but then her insecurities got in the way? I know she has definitely valid reasons for her feelings, but I wish she'd reach out anyway.
She didn't write him a single letter, if you remember in one of the recent chapter, we saw ethan being jealous of servant siblings as they got letter but ethan didn't
My only problem with her is, why won't you write a single letter to ethan ヽ(`Д´)ﾉ