i would say you are doing just fine...you are being exactly right with her and i am guessing she wants reasurrance from you when she cries..how often exactly is it?keeping talking can only help...try and bring her round to your point of view as it is a lot of a happier way to live!
is everything else in her life ok?if so she is lucky and should be enjoyin herself
if you love her the way she is and reassure her all the time, that you love her and want to be with her, then she should be gratefull.....she is lucky to have a guy whom is so understandng
also..tears are tears.it may overwhelm someone whom does not cry often..but they arent a measure of how upset she is...she may just cry real tears easier thanthe majority
Bear in mind though, some people cant change the wya they think..she may always be a worrier!
good luck