This fact from CNN just makes it official:
"It's highly unusual for a woman to get pregnant on her own after age 45. According to the Centers for Disease Control and Prevention, in 2008 there were 0.7 births per 1,000 women ages 45 to 49, compared with 9.9 births per 1,000 women ages 44 to 40."
You can read the rest of the article here.
And she didn't cost $16,000 either.