No. Shop elsewhere. Really.
It's true that sellers have to start somewhere, but you don't need to be the crash test dummy. When the seller starts out by ignoring a simple request, that is already a red flag.
Don't buy it. You will be sorry. I have seen this situation play out all too often and ALWAYS with an unhappy ending.
I agree with everyone else. I wouldn't consider 0 feedback a red flag necc. However the seller need to work just as hard if not harder to make a sale than someone with a good selling history. Since she is not helping you go somewhere else. No help could be a red flag, and always equals no sale. I have taken chance in the past, but they haven't always turned out in my favor. I am sure you will find what you are looking for somewhere else.