The reason that the Church has a problem with IVF is that it dissociates the procreative aspect of sex from the unitive aspect. The child no longer becomes a visible sign of the couple’s love for each other, conceived from a joining of two into one flesh. The mystery of marriage and the Trinity is lost through IVF. IVF also presupposes that a person has a “right” to have a child, which, as the Catechism, states, no one has, because children are not property.
From a more practical standpoint, I also have to question the ethics of performing a highly expensive procedure (I believe the average cost is around $10,000, which in my area is approximately twice the cost of a private adoption) which has a limited success rate (around 30-40%). It is more likely that she will spend a great deal of money and not conceive.
I can understand the desire of couples to have a child. I am a subfertile woman - I suffer from polycystic ovary syndrome (PCOS), and have a short luteal phase (the phase between ovulation and menstruation). Both of these increase my risk for infertility and pregnancy loss. So far, we (my husband and I) think I have already had one miscarriage at about 9 weeks. However, we would NEVER resort to IVF. We have already decided to opt for private adoption. My husband has one daughter from a previous marriage (declared null) and she lives with us half-time. She is like a daughter to me, but we would still like to have more children, so we’re going to go with private adoption.