One thing was weird when I was gazing at the card trying to figure it out. Woman on the card is looking straight at you, and I had a thought: 'she knows!'. I am not sure what could it refer to but it was there. Maybe something I subconsciously know about but am afraid to admit to myself? Bit scary to be honest.
I think you've got it right there in that intuitive flash.. The High Priestess often says "you know what you need to do, look within and take notice of that little voice that you've been ignoring".
The High Priestess sits before a thin veil and behind her is water, an ocean, the subconscious. She is the keeper of secrets and of your own subconscious knowledge..
What is it about your body that you know you should do but you're not doing? Are you exercising enough? Do you eat healthily? Do you look after yourself enough? Have you been ignoring something going on in your physical life that you know you really shouldn't be ignoring?
I think the reading you've done for yourself is a really good one so just to add to what you've already said:
5 Pentacles / Spirit 5s are about change and the 5 of Pentacles is about making physical changes or dealing with physical changes so that could be changes in your health or it could be changes in your life.
Here I think it's saying that you feel as if you need to make changes in your spiritual life or you're actually trying to do that but at the moment you still feel a bit as if you're on the outside looking in.
You'll get there though.
4 Wands / Mind This says to me that mentally you're in a comfortable place. 4s are stable and secure, maybe a bit boring but that's not always a bad thing. So mentally, you're OK at the moment although you may want to start thinking outside of the box to get to where you want to go spiritually (that 5 of Pentacles) and physically (The High Priestess)..
I don't really do Mind, Body, Spirit readings as I find the positions quite confusing so hopefully I've helped a bit.