I was not a theatre major in college, but I spent most of my free time in that department. I had some plans of going on for more education in theatre and acting, and then seeing if I could get a place in a repertory company somewhere. That didn't happen for two reasons. First, I couldn't in good conscience take more money from my parents, and I sure didn't know how to make any of my own (unlike most of my friends, who were much more sensible). Secondly, I never thought I would marry, and when that changed, my plans changed. No regrets! And since my children grew up, I've had the privilege of being involved in community theatre.
All that is to say that life has twists and turns in it. But you know that.
Now it's time for you to look with a cold eye at your assets and your needs. I hope you've been doing that already. Write down on paper the non-negotiables - paying your rent, raising your son, etc. What is the best plan to meet your and your son's needs? Write that down, and then see where your dreams fit in the picture.
Go ahead and send a resume to companies and see what happens - nothing ventured, nothing gained. Pick the brains of everyone you meet in the cloth-diapering field. Learn as much as you can.
I hope you have also acquired a lot of practical skills, even outside the office administration field, because they're what keep you going while you dream.
Investigate - NOW - what it will take for you to get your bachelor's degree. You may decide not to go back to school right now; however, you need to realize that if you do other things and then try to finish your degree, the requirements may have changed by that time and you may have more work to do in order to get it. A BA degree is excellent to have on your resume, as long as that's not where your ambition ends. Keep in mind the old saying, "A college degree never hurt anybody who was willing to learn something afterward."
And congratulations on your AA! Who cares how long it took? You'd be the same age now with a degree or without.