Disciplining an almost 2 year old...

We have really been struggling with discipline lately. Its mainly because my toddler likes to play so much and makes a game out of everything we ask her to do. For example, she wants Daddy to chase her instead of coming when called, etc. We used to tell her no and spank her little thigh immediately, but it just doesn't seem effective anymore. So we talked and prayed about it and knew we needed a new method of discipline. We plan to follow the guidelines in Shepherding a Child's Heart by Ted Tripp and use these charts to really reach her heart rather than just force obedience. But we don't think she has the understanding or attention span yet to jump right to those methods. So I talked to my sis-in-law who has shepherded 2 children through this stage already, and she was really encouraging to me and gave me a lot to think about. So we came up with a simple, abridged version of the SaCH method and it really seems to be working! When I ask my toddler to do something and she doesn't, I tell her to look at me and say, "Sweetie,  Mama told you to do.... Did you do it? She will seriously and sadly shake her head no, and it is so precious! Then I tell her that I have to spank her because she didn't obey and she puts her hands on me or a chair, I pull down her pants, and give her 3 swats. She cries and I hold her and tell her that I love her, etc. Its so hard to do because she is so stinkin' cute and so sweet by this point! But I can tell a difference already. Please pray for us and me especially, because it is really hard for me to put the baby down to discipline my toddler when the baby is nursing or almost asleep, etc. But if I don't discipline her right away she will never learn.