Praise be to Allah.
1.Yes, a woman will be with her husband in Paradise, and even with her children, sons and daughters, if they are Muslim. This is indicated by the aayah (interpretation of the meaning):
“And those who believe and whose offspring follow them in Faith, - to them shall We join their offspring, and We shall not decrease the reward of their deeds in anything.” [al-Toor 52:21]
It is also indicated by the du’aa’ of the angels who carry the Throne:
“Our Lord! And make them enter the ‘Adn (Eden) Paradise (everlasting Gardens) which you have promised them and to the righteous among their fathers, their wives, and their offspring! Verily, You are the All-Mighty, the All-Wise” [Ghaafir 40:8 – interpretation of the meaning]
Ibn Katheer (may Allaah have mercy on him) said:
“(This means) bring them together so that they may find delight in one another in neighbouring dwellings. This is like the aayah (interpretation of the meaning):
‘And those who believe and whose offspring follow them in Faith, - to them shall We join their offspring, and We shall not decrease the reward of their deeds in anything.’ [al-Toor 52:21] This means: We shall make them all equal in status so that they may find joy. This will not be by lowering the one who is higher in status until he is equal with the one who is lower; on the contrary, We shall raise the one who is lacking in good deeds and make them equal, as a bounty and a blessing from Us. Sa’eed ibn Jubair said: when the believer enters Paradise, he will ask about his father, son and brother and where they are. It will be said to him, they did not reach the same level of good deeds as you did. He will say, But I only strove for my sake and for theirs. Then they will be brought to join him on the level where he is.”
(Tafseer Ibn Katheer, 4/73)
2. We do not think that anyone who Allaah has decreed will enter Paradise and have all trace of hatred taken away from them will choose to be separated from a loved one when he or she meets them in the Hereafter.
3. If a woman does not get married in this world, Allaah will grant her a spouse in whom she will find delight in Paradise. The joys of Paradise are not limited only to males – they are for males and females alike, and part of that joy is marriage.”
(Majmoo’ Fataawaa Ibn ‘Uthaymeen, 2/53), There will be no single people in Paradise.
And Allaah knows best.