Am I wrong? What would you do?

My best friend recently asked me to help her plan a volunteer event for 200 people. I said no, nicely of course, because I have a lot going on in my personal life and what she wants is basically a part time job. She told me was disappointed, but understood....then gave me the silent treatment for three weeks!

No response to any of my messages, but I saw her respond to others in group texts. Anyway, last night she finally popped up to tell me that she values my friendship and needed a minute to process her feelings. Oh, and she also had a long chat with her mother about me (she's 28 btw)

I haven't responded because after 10 years of her "me me me" bullshit I'm over it. I know she expects me to come running, but she's being immature don't you think?