Re: Daughter resigned from college after four years
I hope you didn't get a "hands-off, let her make her own decisions" message from my reply. Yes, she has to make her own decisions, BUT, if she is suffering from depression, she needs some treatment. Not necessarily medication, but perhaps you can encourage her to try a therapist (or two or three, if the first one isn't right), and EXERCISE.
The most important thing is to stay in touch, pay attention and show a willingness to really listen without judging. If you notice that she's avoiding people, has a lot of aches and pain, and seems lethargic, apathetic and disinterested in all the things she used to like, those are symptoms of clinical depression. Many people "snap out of" normal situational depression, but clinical depression is more pervasive, and harder to deal with (and sometimes is fatal).
Once you really know what's going on, and her reasons for leaving college, you can bring up the college issue again. I agree with the idea of encouraging her to take just one or two courses per semester. If she's living in your house rent free, that gives you more leverage. My youngest knows that he'll have to start paying rent and his own car insurance unless he goes back to college by his next birthday. (We're not making the same mistake with him that we made with his older brother.)