And now she wants back in my life.

My (f19) ex-best friend (f21) went no contact with me in March over an argument and then a series of stupid decisions between the two of us. I really struggled with this because I was in a really bad depressive episode and was failing a class, so I made so poor choices that I regret and apologized for. 

She went completely no contact for about 2 1/2 months, to the point, that we would be in the same meeting and she would talk to the person directly next to me and not talk to me. It gave me so much anxiety that I would get sick before every meeting because I did not want to see her. Every time I saw a car that even looked like hers, my stomach would drop and I would have to spend the next 15-20 minutes deep breathing so I didn't cry. It got to the point that if her name was even mentioned, I would get sick. 

Since she went no contact, I stopped contacting her unless I had to for work purposes (same college, same job, same hometown for context). I heard from her exactly 1 time before today, when I congratulated her for her promotion and she said thanks. 

I had sent her a work thing that needed the approval of her, our other 2 coworkers, and me. I expected her to just approve it on the website like normal and not say anything directly to me, as she has for the past few months.  Well, today she actually texted me and it has completely thrown me off. 

The other day I noticed one of my friends asking me questions that she knew the questions to (when I was moving back to college, where I was living, where I was working, etc). I know that f21 was at the same place as here and kind of got the feeling that they were talking to each other during this. 

She texted me about the work thing, and then texted me (with no prompting) the day that she was moving back to her college house and asked if I wanted to hang out when we got back. I avoided the question for now, but I don't know what to do. 

We were friends for 6 years before the argument so in a sense I want to try to rebuild our friendship. But, I just got out of the depressive episode, I just got myself to a point where I can function again, where I can go to the store and see her car and not leave. I don't know if I can go back to being her friend when she gave me this much anxiety when we stopped talking. I'm just kind of seeing where it goes since we both don't go back to school until mid-June, but I just needed to vent cause I have all these emotions about this.