Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
A Muslim should follow guidance provided by the Prophet (peace be upon him) throughout all his affairs. The Prophet used to do ruqya. If you are dealing with an evil eye, black magic or even jinn, you can do ruqya on yourself.
It is highly recommended that an individual does ruqya on themselves first before seeking treatment from a raqi. The person who may be under these things has to remember the cure is NOT with the raqi and a cure does not happen instantly with a snap of your fingers.
Even when you are cured from these things, you must continue what you were doing, while you were dealing with these things. When you are performing ruqya on yourself, do not be afraid of anything but put your trust in Allah.
If you do not want to do ruqya on yourself, then you can contact a trustworthy, reliable raqi who does things according to the Quran & Sunnah. The way of making ruqya is by reciting surahs 112, 113 and 114 in your palm while blowing it of your breath and then wiping the whole of your body with your hands.
I also recommend your sister to keep reciting sura al-Baqra at her house. Abu Umama said he heard Allah’s Messenger (peace be upon him) say:
Recite the Qur’an, for on the Day of Resurrection it will come as an intercessor for those who recite It. Recite the two bright ones, Al-Baqarah and Surah Aal-`Imran, for on the Day of Resurrection they will come as two clouds or two shades, or two flocks of birds in ranks, pleading for those who recite them. Recite Surah Al-Baqarah, for to take recourse to it is a blessing and to give it up is a cause of grief, and the magicians cannot confront it. (Muslim)
Almighty Allah knows best.
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