How do you eat an elephant? It's knid of an old joke. The answer is 1 bite at a time.
Your friend had a lot of issues to wade through. She has one glowing resource that she may not realize, though. You, Hestha.
Make a list. Greatest need to smallest need, in your opinion. I'll start it for you.
1. Hestha's friend will open her heart and let Jesus in.
I want and pray she can work through each of her problems. Any one of the things you mentioned are tough; all of them together, completely overwhelming.
Pray for one thing at a time. The divorce, and all aspects surrounding it. Her medical condition, the medications (yes, they are seperate), weight gain, class. It is all important. You could pray for one aspect a day, or take your list and be a prayer warrior, tackling all of it in one extreme prayer...repetitively.
I am so glad you are there with her. Let her know you are praying for her if you think she can understand. This is the tricky part. I don't want you two to get pushed apart by your loving prayers, but she may not understand a Christian praying for her. She may be offended, or defensive. Remember, though, as a Christian, we know that Jesus is the only way. We want her to come around, but based on your knowledge of her, you may have to be patient. Pray hard, and encourage. Hopefully, she will ask what you think about the matter, or something like that, and your door will be opened to gently carress her heart in the way only Christ can.
And before you know it, you have eaten the whole elephant, trunk to tail. It may not taste great all the time, but finishing the meal will be very rewarding to you and her.
Pray hard, love and charish.
RCF