My 16 yr old daughter is 20 days late on her period and her weight keeps going up. She ended her vlcd on June 16 and has had a lot of trouble stabilizing. We are together every day and eat the same things (she is not cheating) I have stabilized fine while she is now up 10 lbs. Her weight did not get to low, at 5'2' her low was 125. Could she be holding a lot of water weight that might get released when she starts? How much of a concern should it be that she has missed a period?