Give her as much tummy time as possible... I. E. Make her lie down on the tummy... This strengthens the baby's upper body... Place some interesting stuff within d reach so the baby doesn't get too cranky while on tummy... U can begin with 5 mins in d beginning n den it may go on for more than that, several times a day

Each child will have to do it eventually some might do it earlier and some might do it late. Don't worry she will. Try to keep something attractive in front of her and encourage to come fwd by just calling her she will start soon.