After what seems like a rough break up, it seems that we might get another appearance of Jane Foster in the MCU. In an interview with Screenrant for promotion for Annihilation, Portman said she would be open to returning as her character Jane Foster in the MCU.
“I’m completely open to everything, but I have no news about that. (Laughs).”
The last time Jane Foster was seen in the MCU was Thor: The Dark World, while the character has been mention after that with the last mention being that she and Thor broke up off-screen. It was also reported that Portman was mad that Patty Jenkins did not direct The Dark World was also not liking the movie overall. Portman has a three-picture deal with Marvel so technically she still has one more movie in her contract.
Since then it seems that Marvel has moved passed the Foster character with now Tessa Thompson’s Valkyrie character. In the comics, Foster becomes the new Thor so maybe Marvel might look at that direction but we must wait and see.