The standard joke is the psychology field is a Bachelor's degree in Psychology and two bucks will get you a cup of coffee (or the degree could help you get a job at the coffee shop).
Someone interested in either of the fields above should be prepared to get, at the very least, a master's degree. However, I would have them strongly consider a Ph.D. program instead of a terminal master's degree program. When I was in graduate school, the state university I attended did not have a Ph.D. program in my specialty (which I wll discuss more in a moment). I received a M.A. degree, but then applied to Ph.D. programs. Once there, I was told I had to repeat all of my statistics courses because, well, they were picky about their stats classes and considered them one of the best in the country.
Psychology is not just one field. I dread telling people I'm a psychologist because their first thing they say to me after my revelation is something along the lines of "Oh my, I shouldnt have told you XYZ, because you've probably been analyzing everything I say....." Psychology has many, varied disciplines. Clinical psychology (think "couch" here) and even within clinical there's family/adolescents/marriage/children/etc. Within those I just mentioned there are different philosphies (e.g. Freudian, Jungian, Behavioral, Cognitive, Cognitive/Behavioral, Humanistic, etc. etc.) There are also lesser known fields such as Industrial/Organizational, Human Engineering, Social, Forensic, etc. Just to give you an example, my field is Industrial/Organizational Psychology and within that my specialty is teams (work teams) and job satisfaction/organizational commitment, especially as it relates to the spouse's contribution.
If your dd is truly interested in this field as a career, have her take a general psychology class (or get her a general psychology textbook) that she can read through and see if one of the fields mentioned in the textbook strikes a cord with her. Also, she should consider what she wants to do with her degree (teach at a university, research, see patients - privately or in a hospital setting, work for the FBI, etc.) I would also have her take a statistics class. Not many people know this, but psychology is heavily grounded in statistics. In my time as a graduate student, I had 10 graduate level statistics classes. By the time I was teaching undergraduates I thought means/standard deviations/correlations/chi-squares/regressions were the easiest things I had ever seen (sort of like teaching 1 + 1 after you've taken calculus).
I don't know how old your dd is, but once in a university/college setting, she should narrow her choice down and take classes that align with that choice (e.g. If she chooses Industrial/Organizational she would probably want to take several business/management courses, too). She won't be able to major in a specialty at the undergraduate level, but those other classes will help her with getting into a graduate program. When looking at graudate programs, she should only look at psychology programs that have her desired specialty and, preferrably, the higher ranked programs (top ten).
HTH. Please feel free to PM me with any other questions you may have.