Send exactly what they ask for. I have always been against "front-loading" for any purpose. The whole notion of it may have caused you problems. Give them what they ask for - nothing more. I've dealt with the HCMC consulate several times - it can be difficult. The fact that they took her passport is probably a sign that you are close to approval. Give them what they want (quickly) and nothing more. Unless there's something major, you will probably get the visa.