What to do when a client doesn’t reply on a offer?

I have had my first mini session ever with a client 4 days ago and it went very well. The client was very enthusiastic and asked me to send my rates by email. At the end of the session I made up a 6 weeks program for her and sent her the package and cost by email. She did not reply yet. Shall I contact her again right now? Leave her more time ? Consider the no reply as a no?
Thank you in advance for your advise.