Arabella and others,
I'm also a pre-med single mum. So while I'm not a success story, I'm on the path with you, also looking for evidence of other women's success. So far, with the pre-reqs and the working part-time, our life is pretty wonderful. (I'm willing to tolerate late nights, lack of sleep...) There's so much that I could say, but this thread has deteriorated. So I'll leave it for another time.
Yes, I believe that you can be a loving, good parent and choose this path. For me, the key is that I'm not really alone. I have a support network of friends and family (including my ex) who would step in at a moment's notice. IMHO, it takes a village...And also a well-constructed plan for how to get from A-B, for you and your children.
You know, there are even people who take 5 years to get through medical school 😱 or have children in medical school 😱. You have all kinds of options.
Listen to the advice and support of those who love you and care about you and your family...not just random people who don't know your heart or your abilities. I also feel that there are people who want to elevate medical school to a supernatural status...but I see it as a job...not an easy one...maybe more of a calling or vocation...but still just a job. A job that we single mums are certainly capable of doing, perhaps even with grace.