Front Seat Belt Buckle Assembly problems of the 2004 Chrysler Town & Country

I have a van Chrysler Town & Country. On September 1, 2007, I crashed it into another car, my mother was a front passenger and my 2 year old daughter was on the back seat in her car seat. After the crash, I made sure everyone was ok, when I noticed that my daughter was not on the seat, she was on the floor of the van with her car seat on top of her, meaning that the seat belt did not work, it got loose. Thanks god she was fine, just very scared. On the other hand, my mother looked ok, just a big bump on the back of her head, she said, but when she tried to get out of the car, her knees were all bruised and soar. Trying to figure out why, we realized that her seatbelt was broken. The release red bottom was found on the floor, therefore we also realized that with the impact of the crash and the seat belt broken, she went further than she should have and bumped her knees with the dash board. The van is being completely repaired and I have the front and rear passenger seat belts.