The 22-year-old recently moved out of the LA house she shared with Pattinson after she confessed to cheating on him with married director Rupert Sanders, reported Us magazine.
"Her parents feel Kristen has really embarrassed herself and don't blame Rob for not calling her back. This is not the Kristen they know," a source said.
Stewart is also said to be be asking her 'Panic Room' co-star Jodie Foster for advice.
"Jodie told Kristen to take no notice of the media bashing and said if she wanted to cry her heart out to her she's always available. Jodie loved Rob and is disappointed with Kristen for cheating on him.
"However, she knows at 22, she's still very young and unfortunately people make mistakes in life. She thinks Kristen will learn from this and will only grow into a more mature person because of it," the source added.