The actor is in Australia for the shoot of his film "The Rover".
"Kristen is really missing Rob. Regardless of their romantic relationship, they are still really good friends. That is something that won't change. Kristen is not ready to say goodbye to this relationship and will do whatever it takes to make it work," contactmusic.com quoted a source as saying.
"She is just being patient and spending a lot of time with her mom. Her mom has been very supportive and just keeps encouraging her to be true to herself and to keep things simple," added the source.
According to eonline.com, the 22-year-old was thrilled when Pattinson, 26, got in touch with her recently.
"She is counting down the minutes until he is home. He loves her, but he wants to work, too, which is understandable," said a source.