I will be against the majority, but I say give it time.... There are persons that don't check their voice mail very often, sometimes after days (I am a case...sometimes I check it until the weekend) Some others just let the phone battery die and don't bother to recharge it until they need it (my wife....) Dead phone means voice mail picking up fast.... How do you know this is not the case????
Be patient, romance is a 2 ways road.... it goes back and forth. For something to happen, it is required that she ALSO does her part..... She will call you. No call after a week, try once more. If no response after another week, it is time to move ON as she obviously lied to you. ..... Time is the key here. You are not stalking, you only have interest in her.... if your initial description is accurate (she asking you about a girlfriend) she likes you, then calling her this often can in fact give you points...... Remember also that every head is a whole different world, you will get a lot of different answers. Make your heart and your mind reach an agreement.
Be patient, don't give up yet. Some girls even want in fact to make sure that your interest is strong enough to call a few more times...... vanity??? Who knows!! Who understand women???
Alex