Why doesn’t the girl I like want to talk to me when she claims she’s in a bad mood?

You're probably making her have a bad mood don't it don't annoy her

More background, me and this girl have been on and off for like 7 months but even when we’re not together we have always been friendly and this past week we were talking and things were great but the past few days she has barely been messaging me at all and she would leave me on read and when I ask y she said she was busy but I kept pushing and she finally told me that she has been in a really bad mood and the only person she wants to talk to is her best friend jaylyn. I’m just confused y all of a sudden she’s been so distant and I don’t understand what’s going throw her mind rn and when I try and be sweet to cheer her up and call her beautiful and **** she said “just so u know we’re not talking like we used to” but the week before when things were going good she liked the flirting and did it back what is she thinking I’m so confused?