hrj_BA

If you are a current grad student at UBC-O can you please shoot me a PM. I have a few specific questions I'm looking to ask!
 
Thank you in advance

I honestly wouldn't look too much into it! These professors probably get 50+ emails all saying about the same thing. I only had one "informal interview" with a PI and it's because we had a mutual connection. I think that may be most of the cases for people who are getting more than a "lukewarm" answer. But this is just from personal experience, so I wouldn't say this is 100 percent true. Personally, I wouldn't get disheartened by this!

You might want to flesh this out a little bit more. Think about how working as a therapist or researcher will help you advocate for women and children that have gone through abuse. I can certainly see this though the research route. Through the therapy route, you may be mostly treating the emotional effects related to the abuse. You may want to get an idea of what the day to day activities are really like in research and in therapy to see if you want to pursue these in the long term. Without knowing all of the little processes that go into providing therapy and conducting research, you may be overestimating the amount of change you can make and overestimate how much you would enjoy the activities.
Sorry if came off as a bit pessimistic, but I think it's important to understand these things before you make a commitment to pursue clinical psychology

This is a difficult one. 
It depends. What exactly do you intend to do in the field? If you want to practice as a psychologist (clinical), you need a doctorate. If you want to do therapy, or more social justice work, a MSW would be cost-effective and might admit you based on your accomplishments up to now. 
However, for the doctorate, my best guess is that you need to have multiple balls in the air at the same time and see how you can juggle them all to make this happen: 
1) you need psychology courses - while some programs don't ask for a major in psychology, they need to see that you've taken the basics; some may accept the Psych GRE, but many may not;
2) you need research experience and some products - some may accept research experience in a different field than psych if it's relevant for your interests and products don't always have to be first author papers; however, you still need a reasonable amount since a) you're coming from a different field and you need to figure out if you want to do this for 5+ years at least and b) to prove to the POI that you can function successfully in a research environment;
3) you need some defined research interests and an idea of what you want to do after you finish, so you can search for clinical experiences for that goal.
The above can be accomplished with a strategic master's, if you hit the ground running from the start so that you can get the most out of it. 
Your age can be a disadvantage (since you probably want to get set on a path already), but also an advantage (you already know the hard work it takes to reach your goals, you may have a more mature approach vs. a 20 year old).
Most applicants work as a full-time research employee in a lab for a year/ two before applying. This may be an option, along with psych online classes, but it can be competitive to get such a position and you'd may be limited to research labs that are more related to your current experience.
As a side note - I know Drexel has a JD/PhD in Clinical Psychology. This is probably competitive and may depend on your flexibility to relocate, but it may meet both of your interests if it's a good fit.
I don't want to discourage you, and to be honest, many of us don't have a straightforward path on the road to becoming a clinical psychologist. I just think it's wise to consider all the implications, including the considerable amount of time and energy involved to get to your goal if you decide on this path. Best of luck!

I wouldn't focus so much on your own amazing theory (we all have them) because PIs usually don't care at this stage. I second other posters in maybe fitting in one of your ideas into a professors existing line of research, you're there to learn from them and develop your own ideas as you progress.

I don't have specific wording advice, but can advise you to appeal to ego: read studies of the PI you are interested in working with and ask them about the study. You can say something like: I really enjoyed your paper on X. I was wondering how [some topic you are interested in studying] would relate to your finding that [whatever their finding was]. Then, you could say you would love to talk to them about those ideas.