What do I do about getting a call from my mother but she wanted to talk to my boss?
Do you know why she wanted to talk to your boss?
No I don't, but she does that a lot.
It's good that you answer the phone for your mom. You should always answer when your parents call you.
It's not like she needs to know anything about my work.
It's understandable that you are uncomfortable with your mom calling your boss. However, it is likely that they are not talking about you or your work.