She may be making an assumption based on a friendship that "details" like that don't matter and you can make the final "adjustments", and might be giving some "assumed" discount based on the friendship and not going the full distance. Is this the same level of quality/price she is doing for others? If it was me and I was on either end of the relationship, a frank conversation is in order. A true business person always would rather have feedback than loose a customer without knowing why.