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 is His slave and Messenger.
There is nothing which prevents a woman who died and did not get married to choose a man from the people of Paradise to marry her. Allaah Says about Paradise (what means): {And therein is whatever the souls desire and [what] delights the eyes.} [Quran 43:71]
On the contrary, evidence is reported that a man of the people of Paradise may have another wife from the women of this world other than his wife. The Prophet said about the men of Paradise: “Each one of them will have two wives.” [Al-Bukhari and Muslim] When Ibn Hajar interpreted this narration he said: “This means from the women of this world.” And it is known that a great number of men of this world had only one wife.
In any case, a Muslim male or female should be concerned about what would make them enter Paradise, like having a correct belief and performing acts of good deeds, and therein [Paradise] each of them will find everything that he/she wishes.
Allaah Knows best.