I am a photographer (sole proprietorship). This year,I decided to resell dresses. Can I use the same schedule C or is this separate business?

My wife is self employed as a photographer for a  few  years now (sole proprietorship). Last year, she decided to buy and resell dresses. Can she use the same schedule C to for income and expenses  from her dress sales or is this considered a new and separate business? will she need another schedule c, another business license, another CRS for gross state receipts?