the answer is very simple.. the moment you have these questions in your heart, you are not ready to accept her.. so even if we give you the assurance that these concerns are uncalled for, can you proceed without hesitation?
marriage is a lifelong thing (supposedly you do not divorce..) so why marry someone who you cannot trust and then feel uncomfortable or suspicious everytime you touch on money matters?
or if you really think she has to be the one for you, then these questions should not be posted to us for help.. post it to her.. you are going to marry her, so you have to be frank and she has to be honest.. only she can give you the answers you want to know.. not us..
whatever it is, good luck!