Good for letting her be the one to broach the subject about counseling. Sounds like you did as much as you can without pressuring her. You told her that you were there for her and that MC was an option. Sounds positive that she is going to see an IC. If she is depressed the IC will be able to work on this either with counceling or meds or both.
I know this is very sad and difficult for you. But you are handling it very well. Wish my H was doing half as well as you in this arena. I know separation sounds terrible but it might be what she needs right now. She needs to miss you, know what she is leaving behind and make the choice to want to be back at home with you. Sometimes people just can't recognize this when they are in close proximaty.
I had a heck of a week so I don't have much more to add today. But I will keep checking in with you. Hang in there. Try to do things for yourself and work on you to keep your focus rather than dwell on the situation.
Me: 30 EX-H: 37 DD: 5 Separated 6/07. MC for months, EX-H quit MC. Divorce Final 8/14/08. Trying to move on with new life.