I didn't order my mom food when I got food for myself
Why didn't you want to order for her too?
She always ask me to order for her. I don't know why she can't order herself.
I get that it can be frustrating, but maybe your mom just likes whatever you get her. It's nice to have a surprise even as small as that. You should at least keep that as a little tradition, just to keep her in your thoughts and have small memories.
She's always late and then asks me what I got her. She's extremely annoying. I told her to order herself...
I understand that can be frustrating. How about asking her if she wants something beforehand? That way she won't bother you after you order.