Chickens go thru 3 molts between hatch and about 5-6 months.What surprises me is that she's laying, and is past the first baby molt, but is still only 7 mo. old. I wouldn't expect a molt until next fall.
Their first major adult molt will be during their second fall/winter.
But many older pullets will have a partial molt their first fall/winter.
7 months is the youngest I've read about....usually they are 9-12 months.