Mom sends her child to kindergarten every day

What do you mean by "sends"?
If you say "she picks them up" it means she drives to the school to get them.

I mean by the whole sentence: in the morning mom drives her children to the kindergarten and in the afternoon gets them back home.

Thank you.

If she drives them, then she doesn't "send" them. That's why I asked.

She drops them off in the morning and picks them up in the afternoon. Kindergarten is for (roughly) 5-year-olds, but you use "children." Does she have twins? Or did you just mean "primary school"?

Sorry, I made a mistake. It should be primary school.

Does driving them not mean "sending"?
What does "send" mean?
I think it means "move a person from one place to another place."

If you send something or someone, it leaves you to go to the other place. I sent him a letter. I sent him as my messenger. My parents sent my brother to boarding school, but I wanted to live at home.

If you drive the person, you did not "send" them.

Thank you very much.

The last question: if mom travels to the school with her children by bus, can you still say "drop them off "?

Does this happen where you live? Do mothers ride the bus? How do they get home?

No, she would accompany them to school on the bus. But this is not something you are likely to need.

Yes, this happens where I live.

Some families don't have a car. So parents would accompany their children to the kindergarten or school if they are small, for parents are afraid that their children will encounter some problems.

How do they get home? By bus.

Ah, I see. I thought you were referring to a school bus.

Yes, they she accompanies her children to school every day.

No, not a school bus.

Thank you very much for your help!!