I've been trying to figure this out, because the way it's showing here that Eudokia was married to both Alexios and Theodore Vatazes, that would make her have been married to father and son.
WIkipedia has the connections differently, which would make more sense:
https://en.wikipedia.org/wiki/Theodore_Vatatzes
Theodore married the porphyrogenita princess Eudokia Komnene, daughter of John II and his empress, Eirene of Hungary,
...and goes on to state that Theodore and his wife's children, including:
Alexios Komnenos Vatatzes (c. 1140–after 1166), married Maria Pegonitissa c. 1158, he is last attested in the synod of Blachernae in March 1166. He was the father of Isaac Komnenos Vatatzes.[11]
His son Isaac's Wikipedia page states:
https://en.wikipedia.org/wiki/Isaac_Komnenos_Vatatzes
Isaac Komnenos Vatatzes was the youngest son of Alexios Vatatzes, a son of the general Theodore Vatatzes and the purple-born princess Eudokia Komnene, daughter of Emperor John II Komnenos (r. 1118–1143), and of Maria Pegonitissa.
So, according to Wikipedia, Eudokia was only married to Theodore Vatatzes and was not also married to their son Alexios and wasn't the mother of Alexios' son Isaac, whose mother was actually Maria Pegonitissa. Rather than Isaac's mother, she was his grandmother.
Her father's Wikipedia also shows she was the wife of Theodore:
https://en.wikipedia.org/wiki/John_II_Komnenos
Eudokia Komnene (c. 1116 – before 1150), who married the military commander Theodore Vatatzes. She had at least six children, but died early.[75]