Yes, there is a good reason. This woman is a 40-something single woman. She's not single by choice, she is because she had to stay home and watch over her ill father. When he died, she was left completely alone in the world, which made her go a little insane. She started creating a pregnancy for herself to alleviate that loneliness. We're also talking about a culture that puts a really big emphasis on women getting married and having children as the only way in life (independently of career and studies, even a successful woman is nothing without kids and a husband to validate her).
Her family, of course, doesn't know that the pregnancy is fake. They look down on her and the "disgrace" she has brought upon the family by getting pregnant out of wedlock (and all that it supposedly entails). They start talking of harsh solutions and the woman becomes so scared she throws fits and lashes out whenever someone wants to take her over to the clinic, because she thinks she'll be forced to have an abortion and lose her precious baby.
Also, the family doesn't really care about the well-being of the baby (which is seen as a disgrace and often referred to as 'it'), so they don't push the matter further and just let her be.
