All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
The existence of Jinn is a fact about which Allaah The Almighty has informed us; Allaah The Almighty Says (what means): {And I did not create the Jinn and mankind except to worship Me.}[Quran 51:56]
Allaah The Almighty mentions that the Jinn see humans and not vice versa; the verse reads (what means): {Indeed, he sees you, he and his tribe, from where you do not see them.}[Quran 7:27]
This verse includes the fact that the Jinn see humans in states in which humans cannot see them. The verse, however, does not categorically indicate that humans do not see the Jinn under any circumstances whatsoever. A lot of people may see the Jinn, but not in all of their forms. The Jinn assume different shapes and appearances, as the questioner said.
Anyone, whether righteous or not, can see the Jinn. We also know that the Jinn are of different sects; some of them are righteous, some are dissolute, some are callers to Allaah The Almighty, some are scholars and so on. Through them, Allaah the Almighty Says (what means):
• {And among us are the righteous, and among us are [others] not so; we were [of] divided ways.}[Quran 72:11]
• {And among us are Muslims [in submission to Allaah], and among us are the unjust. And whoever has become Muslim - those have sought out the right course. But as for the unjust, they will be, for Hell, firewood.'}[Quran 72:14-15]
• {And [mention, O Muhammad], when We directed to you a few of the Jinn, listening to the Quran. And when they attended it, they said, "Listen quietly." And when it was concluded, they went back to their people as warners.}[Quran 46:29]
Allaah the Almighty informed us that the Jinn scheme to harm humans, but their plots are weak; Allaah the Almighty Says (what means): {Indeed, the plot of Satan has ever been weak.}[Quran 4:76]
Dear questioner, you mention that when you recite Soorah Al-Baqarah to your daughter, she does not see Jinn for three days. This is true; the Prophet, sallallaahu ‘alayhi wa sallam, says that abandoning recitation of the Quran and remembrance of Allaah The Almighty makes a house similar to a grave, and that Satan runs away from the house where Soorah Al-Baqarah is read. [Muslim]
Sahl ibn Sa‘d narrated on the authority of the Prophet, sallallaahu ‘alayhi wa sallam, that anyone who reads Soorah Al-Baqarah in his house at night, Satan will never enter the house for three nights; and anyone who reads it during the day, Satan will never enter the house for three days. [Ibn Hibbaan]
There may be reasons behind Satan’s presence in the house and the absence of angels from it, such as the presence of prohibited pictures or statues. Or you could be abusing means of entertainment in a way that causes neglect of religious duties and invites the presence of Satan.
It is apparent that your daughters are possessed, and in order to cure them you should continue making Ruqyah until Satan is completely exorcized. Perform Ruqyah for your children and pray in the morning and in the evening that Allaah The Almighty protects them. It would be better if you teach them some Athkaar (remembrance). It would also be better to ask a Shaykh (religious scholar) who is committed to the teachings of the Prophetic Sunnah (tradition) to recite the Quran and perform Ruqyah for them.
And Allaah Knows best.