So i was feeling depressed the other day and she wasnt feeling herself either so i just left her alone, you know give her some space. But then a few minutes later she said she was going to sleep. I was like alright goodnight and then i told her i wont be online till Friday-Saturday. she got really mad at me and then the next thing i know she deleted her instagram (were online friends for a good 2 years now) and now shes not answering me. I think i fucked up really bad this time...what do i do?

you feeling depressed is okay, her not feeling herself is okay too, write her an email and explain yourself, apologize, and ask her to tell you what went on. you could call instead, some people find thats more personal, and easier to forgive people through.
all in all, theres not much you can do until she calms down and thinks about everything. You've admitted to messing up, now she has too also.
pushin contact may drive her away, so take your time with it.
Best of luck!
/sage

Contact here? Can't be that hard.