I think that you both should have had counseling instead of just you. It takes two to tangle. Don't tell me she tells you that she doesn't have problems with herself and doesn't need to change.
It doesn't seem like she is willing to work on the marriage because she is staying a distance from you. She can't see results because she doesn't stay at the home long enough to see that you have made some changes within yourself. Maybe she is staying away as well because she is also in denial and has her own problems to work on. With the way things are going now, she is not wanting to make things work and is thinking about herself rather than thinking how much this is hurting the girls and you.
You are the only one trying hard to make things work, she isn't putting an effort to do the same so that's why you are giving up on your marriage. She has given up already, but has not tried hard enough to keep you. Instead of her wanting to give up, she should have supported you in the beginning when you were meeting with a counselor. Marriage is being a team and working out the problems "together", not alone.
I believe if the girls and you are so important in her life, she still can have that spark in the marriage. She just needs to know how to get it back. I really don't think she is trying to find it, otherwise, she would be with you. Don't you think if she wanted to get results, she would do what it takes to get them?
I would consider you and her to read "The Proper Care and Feeding of Marriage" and "The Proper Care and Feeding of Husbands."
I really think that your marriage can be saved, only if you both want to save it, plus for the sake of your girls. Because they are the ones who will suffer the most if you two decide to divorce. I think that your wife needs to stop thinking about herself and start thinking about the whole family.
Your wife still loves you. If she didn't, she wouldn't be trying to find the spark, right? You see, both husband and wife need to show "Appreciation, Love, and Respect" for each other.
No need to keep feeling sad anymore. You need to start being positive about this. Otherwise, your girls will see that you are falling apart. Enthusiastic! Your girls need both parents in their life.
Do get those books and read them. It is important in your marriage. If she needs someone to talk to as well, I am here to help her. I wish the best for you both and never give up on your marriage. Your kids need you both!