This is very good news, it seems that she is trying to help herself now. Just keep in mind that the meds take some time to kick in and work properly to help her.
You may see even more depression before it start getting better. But, the important thing is that she will certainly take the edge away.
Many depression medication have a suicidal side effect, so I would advise you to keep an eye on her to make sure things won't go to a different direction. By the way, do you know if she is still doing drugs? That can also compromise the effect of the anti depressant.
Be patient with her and try to support her during this time. I think you are doing good letting her know she is not alone and that she knows you will be there for her.
Of course you are DBing, so you are not just out there with your arms open waiting for the next pain, but a good friend in the distance will make her feel more secure.
RD, life is hard and this time for us is even harder. But, in some ways it is hard for the WAS too. I think you and your W have a chance, it may take time, but there is a chance your family will be complete again.
Hope everything works out well. By the way, I am not Salma going to the Red Carpet, I am an average lady, getting old too. I am more like Salma waking up in the morning without any makeup on. My kids said that with age I will look just like Red from Orange is the new Black. Please, don't think that I am this angelical princess because I am not.
Have a good night. May tomorrow be filled with hope for you and your family.