Hi,
That sounds like a good sign to me. Maybe she isn't in the mood?
You could try misting them ( I think it helps spread the scents? ), or pairing them 24-48 hours after she had a meal or just after a shed.
Do you have any others at breeding size you could use to mix things up a little?
Maybe putting the shed from another male or female into the tank with them might be enough to spur some action.
dr del