what was she thinking?

My mother (if you can call her that) called today to wish my son a happy birthday. ( is was in fact his 6Th birthday and it was great to see him excited about moving up in the world!)
I was shocked that she would bother after the hate E-mails I have received, I tried to set things right, to lay ground rules considering the unfair treatment my kids received in the past and haven't heard a thing since. She asked to speak to him... I asked what? After not hearing from her since my last E-mail. she tells me that after that she has no intentions of ever speaking to me. So I'm supposed to let her speak to my son? I don't think so. She hung up without another word but it left me thinking.... What the F--- was she thinking? That she can cut me out of her life but have my son still on speaking terms? That I wouldn't care? That I just forgot how she hurt my daughters feeling? What was she thinking? I really don't know and further more don't care!