Exactly, don't contact her, but do communicate if she does.
An ex told me I killed her this way when i decided to just ignore her. Only took her a few days to come back to me.
But it depends on the girl and situation. If you just straight up ignore her after all the texting and calls, etc. Then she'll be wondering wtf is going on. She might contact you.
And if she don't...well maybe at that point you are over her. Everyone wins.