What should I do if I don't call her back or text her back?

In fact, she doesn't feel as good about you as you say.

It is obvious that she doesn't want what you gave her.

I suggest you don't contact her for a week or so, and then contact her again.

If she is still the same as now, I advise you to give up.

If she responds to you, don't put any pressure on her.

Don't send anything, don't contact frequently, don't go to work, and don't say anything that suggests confession.

Contact her completely as a normal friend,