It really depends on what she wants to do and what she currently has.
"Cloud Based E-Commerce Solution" in many respects doesn't mean a thing. Everything on the internet is "in the cloud", unless she happens to have a physical computer in her office that is running her web server, which isn't out of the question, but would be atypical. I guess the question comes down to "build or buy?".
You can have a web site hosted at any number of hosting providers, and manage the development yourself ("build" - hire someone to customize/add features to what you currently have), or "buy" (more like rent) a complete solution. A complete solution might offer integrated content management, customer management, inventory control, shipping/receiving support etc. A bunch of software that is already written for managing a small to medium sized internet based business.
From what you initially described, she might want to have a developer add a few more "pages" to her existing site that a customer would never see, but would allow her to add items/update quantities or whatever specifically could streamline her internal processes.
I think it depends on volume, price per item etc., as to what particular process steps would make her business more efficient, and without more info on the specifics of the business it's difficult to offer any suggestions - sort of like "what scope should I buy" in snipers hide terms.