Loneliness

This girl and I were best friends for two years. We did absolutely everything together and we work at the same place. We had an argument that ended up ruining our friendship. It’s been 3 months. We still see each other at work but we don’t speak anymore. I feel like she does want to talk to me at times but it seems like it’s never the right time. We’re always too busy working. I want to get closure and ask if we’re done being friends for good. Should I ask her if we could talk or should I leave it as it is and completely forget about her?

P.S in my eyes she’s still my best friend and I miss her like crazy.