vent?

I don't understand why my mom ignores me for no reason. She only ignores me and behaves normal with my brother and her mom. I don't like it when she ignores me, why can't she talk to me like a normal adult instead of ignoring me? it's really annoying. Whenever she ignores me, I feel weird.. Like I don't know how to explain this feeling. I ask her or say something to her, she stays silent and acts like I'm not even there.. She doesnt even bother looking up from the phone or whatever she is doing. Why does she do this? I feel really hurt. Shes been ignoring me since morning today, she'd say something, like a word or two to me then nothing..