The loss of one's own genetics is a dramatic step in many women's lives. The good news is that grieving the use of one's own egg cells is a normal part of the process, and many women understand that parenting is not 100% about genetics after a few months.
Remember that the donor may be the genetic DNA source, but she is not the mother. You are the one who is going to be a mom, regardless of whether it is a donor-conceived or biological child.
More info here: Telling children about their conception by gamete or embryo donation.