Let me be frank. This is just my opinion, so take it as food for thought, or a train of research for you, as you evaluate your decision. One question you should answer for yourself: do you have a burning passion to be a lawyer and has this been a lifelong dream, or is this something that came up that seems like it could be a good idea? If the latter, you really need to reconsider the decision. Do a ton of research on the legal market, hiring trends, and salaries - do not buy into the idea of the law school dream and certainly do not take law school employment stats at face value.
I think the prospect of going to law school as a single mother with those numbers could be a huge mistake: (1) probably wont do great on scholarships, (2) probably will be going to a T3 or T4, (3) potentially looking at spending upwards of $100K for the degree, and (4) as I post ad nauseum, employment prospects for you will be grim. That is a big risk to take when the life of your child can be impacted. MORE IMPORTANTLY, law school will rob you of 3 to 4 valuable years with your child helping him/her grow and develop. I went to law school as a married father - the entire burden of raisng the kids shifted to my wife and my kids got used to me not being around, that hurts. The stress level is incredible when you try to balance kids and law school - I cannot fathom a single mother trying to do this.