|Kristen Stewart and Rupert Sanders|
The 33-year-old model - who was left stunned when her filmmaker spouse's romance with the 22-year-old actress was revealed in July - has been in contact with her spouse over their children Skyla, seven, and five-year-old Tennyson, but is unsure whether she wants to reconcile with him.
A source told Us magazine: "Nothing has been filed. It's still too early to tell what will happen.
"She is talking to and seeing Rupert now for the kids, but as far as the marriage she's still processing everything that happened."
The brunette model - who played Kristen's on-screen mother in 'Snow White and the Huntsman' - is keeping a low profile and wants to deal with the situation in "private."
The source added: "No decisions have been made. It's been very hard on her dealing with this and all the media attention.
"She is very strong and working through it and keeping private about it."
Liberty has been spotted out and about in Los Angeles without her wedding ring recently, causing 41-year-old film director Rupert to worry he has made the "worst mistake of his life".
An insider said: "Rupert is willing to do absolutely anything and everything he can to save his marriage, he realizes this is the worst mistake of his life, and he cannot believe he was so stupid."