I think the notion of photography as a side gig is an interesting place to start if she doesn't have much a) photo or b) business experience.
I am going to offer some words of caution on both sides, but first, give a little bit of my background. I started taking photo classes in elementary/middle school. Continued in high school, and was the photo editor for the yearbook. I didn't do much with it in college, but my first job out of college needed a photographer for a new web site. When I quit that job full time to go back to school, I picked up a bunch of free-lance work. I also did some free-lance/event photography along the way. I learned a few lessons the hard way:
1. Doing something you really like for other people sometimes ruins the hobby for you. I had been doing photography for my own purposes for a long time before anybody ever paid me for it. This was a tough adjustment. Suddenly, the clients expectations trump your artistic vision.
2. It is very difficult to get paid sometimes. I spent more of my time fighting to get paid on $100-$200 gigs than they were worth. And it nearly cost me several friends who had set me up with gigs with their friends.
3. The first step of running a business is being good at what the business does. She needs to invest a bunch of time learning photography from the ground up. Many people have flooded into photography with the advent of digital cameras. It certainly has made some things easier - and some computer savvy goes a long way in post-processing and fixing images.
4. Gear matters. You can get good pictures out of inexpensive gear if you know what you are doing. But if you show up with gear that anybody can buy at Costco for $500, people expect the photographer to be a big value add.
5. Personality matters when shooting people (especially weddings and kids). The best wedding photographers I have seen blend into the wedding. The worst want to make it all about them to get the pictures they want/need in a very controlled way. I was a guest at a wedding once and nearly punched the photographer the tenth time he saw me lining up a shot and stepped in front of me (at the reception, not the ceremony). Successful wedding shoots require lots of planning and identifying what the couple wants, needs, and expects - not just in the pictures, but in YOU.
6. It is WORK. Taking photos of a single event isn't that hard. But the work doesn't end after the event, THEN you have to deliver. You also have to continually market if you want to grow, and that marketing takes time and money. The best gig I ever had I was paid a pretty handsome hourly rate to shoot a bunch of film they provided, and then hand over the film on my way out. I didn't have to deal with processing, QC, NOTHING. I hope those pictures came out...
I don't want to talk her out of a goal, but I think getting into professional photography is an "eyes wide open" opportunity. If you know what you are doing, and commit, you can make a bunch of walking around money. But I have known more than a few people who got into it and then quit when it turned into something resembling work.
-shooter