From the OP I take it you are talking about a commercial bakery so that is what I'll talk about.
PP's have touched on a lot of the salient points. That it is hard work with long hours, and working in a bakery is a lot different than making baked goods in a kitchen. Flour and other ingredients come in enormous bags and they need to be stored, lifted and dumped into large commercial mixers. Much of the work is repetitive, like scooping a large mixer full of muffin mix into pans, or catching bread coming off the sheeter, putting it on pans, placing pans on racks, then in proof boxes, then in ovens, then bagging, etc. Product needs to be fresh and ready for morning customers, so often your work starts during the night. And yes, it gets extremely hot around the ovens, which may be nice in the winter but excruciating in the summer (vice versa for the freezer, lol).
I think what many people don't realize is how high utility bills are in a bakery. That is what's led to the demise of many bakeries of old. It is not uncommon for a small bakery to have utility bills in the thousands each month. Ovens, freezers, refrigerators, proof boxes, mixers, lights, etc, all use a lot of power. You need to factor in paying those costs with other operational costs such as paying your employees, ingredient costs, insurances (including workmen's comp), vehicles, label maker, boxes and plastic containers, nutritional statements, etc. And generally all these must be paid before you pay yourself.
Additionally, you will have to pass city and state inspections before you're issued a permit to operate, and regularly therafter, usually unannounced. This means that the bakery has to be in tip top shape with no issues of cleanliness or disrepair anywhere. They will get you for things like peeling paint or water puddles, rags in the sink, dried product on bowls and mixers, improperly stored product, temperatures being off, and a host of other issues. In other words, the bakery has to be impeccibly clean and regulated at all times. Your employees will ideally have Serve Safe certification as well. Someone getting sick from one of your baked goods can put you out of business. Regulations vary from place to place but in many areas, if you serve food there (ie tables), you need to have a bathroom available to the public.
Remember you will be competing with supermarket and wholesale club bakeries so your products will need to stand out from them if people are going to pay more and go out of their way to come to you. Don't disappoint them with anything stale or overbaked, etc. Word of mouth will filter out fast. Anyone working with you has to follow the rules and formulas so you have a consistent product every time.
I agree with the poster who said your DD might want to get a job in a bakery first to see if it's even something she wants to pursue further.
I don't mean to be discouraging but this is the reality. It's why there aren't too many small bakeries left anymore. A lot of the old bakers have retired now as well (and we have "pastry chefs" instead of bakers). The question is, is there anyone left who wants to do the grunt work?
Salmonella outbreak closes RI bakery:
http://www.wpri.com/dpp/news/local_news/northwest/defuscos-bakery-ordered-to-stay-closed