Rif Kiddushin 18b {44b-45a}

18b

{Kiddushin 44b}

מה אביה משוי שליח אף איהי נמי משויא שליח או דלמא כחצר אביה דמיא ועד דמטי גיטא לידה לא מיגרשה
אמר ליה אין עושה שליח וכן הלכתא:

such that just as her father may appoint an agent, she too may appoint an agent. Or perhaps it is like the courtyard {rather than hand} of the father, and until the get reaches her hand, she is not divorced.
He said to him: She cannot appoint an agent.
And so is the halacha.

איתמר קטנה שנתקדשה שלא לדעת אביה
אמר שמואל צריכה גט וצריכה מיאון
וכן אמר רב צריכה גט וצריכה מיאון
צריכה גט שמא נתרצה האב
וצריכה מיאון שמא לא נתרצה האב
ויאמרו אין קידושין תופסין באחותה
אמר רב נחמן והוא ששדכו

It was stated {by Amoraim}: A minor girl who became betrothed without her father's knowledge:
Shmuel said: She needs a get and she needs refusal {miun}.
And so did Rav say: She needs a get and she needs refusal {miun}.
She requires a get, for perhaps her father wanted it. And she requires refusal, for perhaps her father did not want it and people will {mistakenly} say that betrothal would not take hold by her sister.
Rav Nachman said: And this is where they arranged the marriage beforehand.

{Kiddushin 45a}

איתמר מת אותו שקדשה ונפלה לפני אחיו ליבום
אמר רב הונא אמר רב ממאנת למאמרו ואינה ממאנת לזיקתו
עשה בה מאמר צריכה גט וחליצה ומיאון
צריכה גט שמא נתרצה האב בקדושי שני
וצריכה חליצה שמא נתרצה האב בקדושי ראשון
וצריכה מיאון שמא לא נתרצה האב לא בקדושי ראשון ולא בקדושי שני ויאמרו אין קדושין תופסין באחותה

It was stated {by Amoraim}: If that person who betrothed her {in the above case of a katana without her father's knowledge} died, and she fell before the brother for yibbum --
Rav Huna cited Rav: She may refuse to his maamar {the Rabbinic equivalent of kiddushin before yibum} but she cannot perform refusal to his levir connection. If he performed maamar on her, she requires a get, chalitza, and refusal.

She requires a get for perhaps the father desired the second kiddushin {=the maamar}.
And she requires chalitza for perhaps the father desired the first kiddushin {to the deceased, such that to be free of the levir, she requires chalitza}.
And she requires refusal, for perhaps the father did not desire either the first kiddushin nor the second kiddushin, and they {=people} will {mistakenly} say that kiddushin would not take hold of her sister {if the levir would try to marry her}.