When you can't bear something, you can't stand it or put up with it.

In other words, you cannot tolerate it.

Another common phrase with bear is to bear responsibility, which means to assume responsibility for something.

You have to make some noise if you want to be heard in Ella's mom is speaking figuratively here when she says, you have to make some noise.

If you want to be heard, she means that you have to fight for what you believe in if you want anything to change.