It will take moves. First, do not act put out and get pouty and brooding. Bitches do not like that. When you get like that they think you are immature. Rather, act like there is nowhere else you would rather be than with her. But, when she apologizes for being late, just smile and say something like, "it's no big deal, but you owe me!", then leave it alone and do not explain. That will plant a seed in the back of her mind that she has a debt to pay.
Now, this will go nowhere if you **** it up and start acting like a douche bag. During dinner, drop it one more time. Say "You know, I was a little worried that you were not going to make it tonight since you were running late." Make eye contact when you say this ( and anything else).
The idea is to make her feel like she owes you and that you have an expectation of payment, and that you really like her, even if you do not.
Remember, there is nothing magic here, just psychological leverage. You mainly need to make her feel comfortable, make her think that you are really into her (but not in a creepy way), and let her know that you will **** her. This last point is important. You don't just say it. You have to be subtle. There is no quicker way to be put into the "Friend Zone" than her thinking that you are not much of a cocksman. If you let her know in a subtle manner that you will **** her then it shows acceptance of her, that you are experienced, and that you expect something of her.
Be subtle. I cannot over emphasize this. Do not just blurt out that you like sex, or some other awkward statement. You should read the vibes. Sometimes you just got to ask them if they want to go over to your place. Touch her hand, shoulder, or back. Do not touch her face, tits or ass. As I said in a prior post, take her dancing. Don't act like a *** on the dance floor, just keep eye contact and handle her body firmly.
Every woman can be seduced. At least you know that this chick ***** since she has a kid. She may be grateful for the opportunity. Just be smooth, keep eye contact, talk sparingly (let her do most of the talking while you maintain eye contact and nod and smile occasionally to simulate interest), and act like she is the most important person in the world in this moment. Mention her tardiness, but do not seem ticked off. Do not mention it more than twice. Once when you pick her up and again over dinner.