From day one of Kate's first year at college, her mother saw her as both 'green' and naive. If she had known how soon Kate would become involved with a boy met at a first-week mixer, Jean would have had her home those first few weekends instead of "getting used to being on her own."
初日
しょにち
初日から、彼女は間違っていた。
しょにち から、 かのじょ わ まちが って いた。
From day one, she was wrong.
Denshi Jisho has
間違い
まちがい
1 : mistake, error, blunder
2 : accident, mishap, trouble
3 : improper conduct (e.g., between man and woman) ; indiscretion
common word ; noun
間違う
まちがう
to make a mistake, to be incorrect, to be mistaken
common word, Godan verb with う ending
Perapera browser plugin gave me
初日 しょにち (n-adv,n-t) first or opening day; (P)
初日 はつひ (n) New Year's Day sunrise
初 はつ (adj-no,n-pref,n) first; new; (P)
初 うい (adj-no,n-pref,n) first; new; (P)
初 うぶ
(adj-na,n,adj-no,n-pref) innocent; naive; unsophisticated; inexperienced; green;
wet behind the ears; birth-
初 ぞめ (suf) first doing of ... (ever, in one's life, in the new year, etc.)
Google translate gives
それは彼女の初めてだった。
for
It was her first time.
and
それは、家から離れて彼女の初めてだった。
for
It was her first time away from home.
NOTE: also from Denshi Jisho web pages :
グループ１動詞
グループいちどうし
godan verb
noun
子音動詞
しいんどうし
consonantal verb (e.g. godan verb); consonant stem verb
noun
