I'm not sure I'm the best one to give advice since I'm new to all this.
I think you need to continue with what you've been doing. Don't get too close to her but don't let her feel you're not interested in her.
I wouldn't "pursue" her though as it might push her away. Date her without being too touchy feely. Compliment her hair or what she's wearing.
When you spend time with her and D this weekend play it cool and play with your D (you know how much a 6-7 year old loves to play!!) and that'll show your wife how devoted you are to your D. What woman doesn't love a dad who gives his time to his children?
Follow Ws lead. You know her better than anyone.
Jen *The more anger towards the past you carry in your heart, the less capable you are of loving in the present*