I'm sorry that your daughter has had these experiences and that it has caused you to see an entire profession in this light. The physical therapy profession, as do many health care professions and professions in general, certainly have issues that they face, but overall, I would still stand by physical therapy as an amazing career choice. Now a few points:
1) The debt. This is a real issue, and it is known in the profession. The president of the APTA addresses the debt crisis in basically every talk she is giving. There is a push to stop adding to PT curriculums and instead decrease the number of credits to decrease costs. While I strongly think we need to make PT school more affordable for all (as well as increase reimbursement so debt is easier to pay back), if you and/or your daughter were surprised by the debt load, that is on you. Everyone should be making informed decisions about the debt they are willing to take on, and go to the most affordable school they can.
2) PT schools as a business. Some certainly are! USA for instance, is a for profit business. Yes, it is a legitimate path to a DPT, and has enable many to become a PT and they certainly don't regret it, but the school will be making decisions like a business. It is up to each person if they are ok with this model of higher education. Public universities, the most affordable route to PT, are NOT businesses! Private schools are somewhat of an inbetween- there is certainly pressure on departments to increase class size to bring in more money, but this money is often reinvested in faculty and facilities that benefit students. I do caution about random PT programs that pop up at small liberal arts colleges, as these can be a cash cow for the school. My recommendations in general are public first, for affordability, followed by private schools that are in established medical schools or large allied health departments. Again, it is on you if you choose a school that is a business if you do not want this model.
3) Career prospects- I have never heard of a PT who had difficulty finding a job (maybe the perfect job in the perfect city was an issue, but let's be realistic). The field is far from saturated, and growth is expected. Wages, that is another issues. I agree that wages are stagnant, unless someone makes it in private practice. Future wages should be taken into account when deciding the level of debt you are comfortable with. I'd recommend getting involved with the APTA to help advocate for better reimbursement for the profession.
4) Job satisfaction. Burnout is real. We were taught about it in school, as is done in many programs. It is not a PT specific thing, but all across medicine. However, while there may be groups of PTs regretting their degree, I'm part of many facebook groups proclaiming how awesome our profession is on a daily basis. In general, I'd unscientifically say PTs are some of the happiest people at work I know.
5) Unethical practices. Unethical is unethical, and should not be done. Your daughter should be aware of many ways to report unethical billing practices, and should not partake no matter the pressure. I'm sorry this has been her experience, I have worked in many settings and never encountered it, but like any field, bad apples are out there. Now, while ethical, there may be pressure to see many patients an hour, which may conflict with what she wants/feels is best treatment/best for her health. This is allowed, some clinicians love the hustle, others don't. Thankfully, we choose what setting we work in, and can certainly find OP where the model is 1-on-1 for an entire session, as well as other settings. I like to treat one patient at time, and everywhere I've worked I've been able to.
Bottom line, I'm sorry your daughter has had bad experiences and regrets her choice. PT isn't for everyone, but overwhelmingly people do seem to love their jobs. There are real issues that face the profession, that people should think critically about when choosing the profession and choosing a school, but overall, the future of PT is quite bright.