Man Id be concerned if she has caller id! How many times do you call that day?
Id call the guy im dating back within a day-why play games? If Im interested in someone Id want to talk to them-start hookn up! Cant do that if you dont return calls.
Give her a call and LEAVE a message. If you know she had surgery the sweetest thing would be to leave a message that you were thinking about her and hope she has a speedy recovery. SAY SOMETHING! Give her a chance its only been a couple of days and things do happen. But if she starts showing repetittive behavor of not returning phone calls-RED FLAGS!