Praise be to Allaah.
If the argument was not caused by you and you have tried to
uphold ties with her, and she is the one who refused, then there is no sin
on you, but you should carry on trying to uphold ties with her and treating
her kindly as much as you can, and ask Allaah to reconcile between you and
protect you from the tricks of the shaytaan.
Muslim (2565) narrated from Abu Hurayrah (may Allaah be
pleased with him) that the Messenger of Allaah (peace and blessings of
Allaah be upon him) said: “The gates of Paradise are opened on Mondays and
Thursdays, and every slave who does not associate anything with Allaah is
forgiven, except a man between whom and his brother is some grudge. It is
said: Wait for these two until they reconcile, wait for these two until they
reconcile, wait for these two until they reconcile.” This is an important
hadeeth that points to the seriousness of severing ties and bearing grudges,
and shows that they are impediments to forgiveness.
Ibn Raslaan said: It seems that if one of them seeks to
reconcile with the other but he does not accept it, the one who seeks
reconciliation will be forgiven. End quote from Sharh al-Zarqaani ‘ala
Al-Bukhaari (6237) and Muslim (2561) narrated from Abu Ayyoob
(may Allaah be pleased with him) that the Prophet (peace and blessings
of Allaah be upon him) said: “It is not permissible for a Muslim to forsake
his brother for more than three days, each of them turning away from the
other when they meet. The better of them is the first to greet the other
Ibn ‘Abd al-Barr said: They differed concerning two who
forsake one another and one of them greets the other with salaam – does that
mean that he is no longer forsaking him or not? Ibn Wahb narrated that
Maalik said: If he greets him with salaam then he is no longer forsaking
him. It is as if – and Allaah knows best – he based this on the words of the
Prophet (peace and blessings of Allaah be upon him), “The better of
them is the first to greet the other with salaam.”
Abu Bakr al-Athram said: I said to Ahmad ibn Hanbal: If he
greets him with salaam, will that be enough with no further need to speak to
him? He said: That depends on whether he used to do that before he forsook
him. If it is known that he used to speak to him then merely greeting him
with salaam does not mean that he has stopped forsaking him, unless it is a
kind of greeting that is not immediately followed by turning away.
Something similar was also narrated from Maalik. It was said
to Maalik: A man forsakes his brother then he greets him first without
speaking to him any further. He said: If the other man is not causing any
offence to him, then that is not sufficient to end the rift unless he speaks
to him and lets go of the reason why he forsook him. End quote from
Al-Nawawi said in Sharh Muslim: “The better of them is
the first to greet the other with salaam” – this is the evidence for the
view of al-Shaafa’i and Maalik and those who agree with them, that the
greeting of salaam ends the forsaking, and removes sin from the person. But
Ahmad and Ibn al-Qaasim al-Maaliki said: If he is still causing him offence,
then the greeting does not end the forsaking. End quote.
To sum up, the fact that you greeted your sister and spoke to
her means that you are no longer guilty of the sin of forsaking and severing
ties. We ask Allaah to accept good deeds from us and from you.
And Allaah knows best.