Here's what I do with my private students:
1. They write an article and get to me prior to class in some digital format- usually in the body of an e-mail or as a Word document attachment. If they bring it with them or send it immediately before class, then I make sure they know they are paying me by the hour to process it while they wait.
2. I copy the article just below the original and then I break each sentence out of paragraph form and number them so we can easily refer to them and talk about them. Double spacing leaves room for their notes. I print a copy for each of us.
3. When we are together, I first have the student read the article aloud, then I give them time to suggest improvements or mention errors they have found in reading.
4. Then we go one by one through their sentences. I point out first any errors in spelling or structure (sentence fragments) and then we talk about usage. I ask questions to try to get the student to recognize ambiguous or confusing usage.
5. I suggest alternative ways to express what they mean, but I try very hard not to tell them what to write. My goal is to help them remember things they already know. If they don't know or if I see the same error(s) consistently, then we need to spend some time on that topic. I also watch for signs that the student has written their article in their native language and then translated it (poorly) into English. That's a definite no-no!
6. I expect the student to be taking notes as we discuss the article, because they are to rewrite it and we will talk about it again.
7. Sometimes, I'll do a suggested rewrite to show them after they have done their own rewrite.
Your friend has made a lot of mistakes! You mention that you asked her to write something. It's not clear how much criticism she will accept. I suggest you start with spelling. Your friend is lazy about that. I guess she is relying on Spellcheck or a smart-phone dictionary- neither are reliable! Next, you could talk about the use of articles (a, an, the). Then you could talk about verbs- that's a big topic where she needs a lot of help.
I hope my suggestions can be a starting point- good luck!
Student or Learner