I just told her I refused, and now I don't even return my phone messages. What should I do?

It is normal to be rejected for the first time.

You don't have to worry too much, because she just received your confession, so she feels a little shocked and a little difficult to accept love.

You tell her to calm down for another two days, and then you send her a message.

Don't send her a message now, after all, she is still ignoring you.

Don't be afraid to refuse once, there is still a chance.