Her eye caught the middle: "lktkwth" — that looked like "l k t k w t h" — seven letters. "l k t k w t h" could be "l a t a w t h" if you shifted... No. But "k" to "a" is minus ten. Inconsistent.
Then Lena noticed something. The final word: "wks..." — if you shift w back three, you get t . k back three is h . s back three is p . "thp..." No. But wks could also be the if you shift forward? No, w forward three is z . Dead end. nwdz msrb lktkwth sghnnh bjsm abyd wks...
They tried: first letter n (14th letter) shift by 1 = o. second w (23rd) shift by 2 = y. third d (4th) shift by 3 = g. fourth z (26th) shift by 4 = d (26+4=30→4) — "oygd" — still wrong. Her eye caught the middle: "lktkwth" — that
Still nonsense.