(1) She is married to Seleucus I.
They got married in the year 300 BC.Source 1
"Notwithstanding the disparity of their ages, she appears to have lived in perfect harmony with the old king for some years. Seleucus and Stratonice had one child, a daughter Phila, when it was discovered that her stepson Antiochus was deeply enamoured of her.
In order to save the life of his son (which was supposedly endangered by the violence of his passion), Seleucus gave up Stratonice in marriage to him in 294 BC"
The couple were divorced in 294.Source 1
(2) She is married to Antiochus I Soter.
They got married in the year 294 BC.Source 1
Child(ren):