Mueller told Aspen cops that Sheen had attacked her previously and RadarOnline.com has uncovered the details.
The warring couple were arguing months ago when Charlie exploded and shoved Mueller, causing her to fall down and hit her head on the floor, she told friends.
A source familiar with the situation told RadarOnline.com: "She banged her head on the floor and even ended up going to see a doctor because of it. She didn't tell the doctor that Charlie pushed her because she didn't want it reported."
That goes toward explaining why Mueller is heard on the Christmas day 911 audio saying FOUR times, "I gotta file this report."
Now Mueller has hired attorney Yale Galanter who says she wants to reconcile with Sheen. As RadarOnline.com has reported exclusively, Team Sheen has offered to add $1 million to her prenuptial agreement and told her if Sheen goes to prison over this incident there will be no money for Mueller.
"She'll stay in it for now because she doesn't want to be broke," one friend told RadarOnline.com. "But that marriage has been over for a while."