My friend is angry and yelled at me for it. I didn’t do anything!

Yesterday I said what’s up to my friend and she gave a bored “hey” and I asked how she was. She said her job cut her hours to four days a week instead of 6 and I didn’t hear the rest. I thought it was a good thing but she said, “No! It’s NOT! They cut my hours and I need the money!” She looked upset with me and walked off. I thought they we’re giving her a break from working so many hours. I told her I was sorry but she didn’t hear. I think she’s very upset with me and didn’t speak to me for the rest of the day. It isn’t my fault. I felt bad for her but I misunderstood. Has that happened to you?
I couldn’t stop crying because……I didn’t know why I was. Pathetic me. I always feel like I did something wrong. I tried to say bye and sorry for what happened, she didn’t look my way.