only reason i doubt this is mc mentioned to bella his mom's death, so i think she would have said something not a lot of local died in childbirths 19 years ago. Also bella was at another collage then too
Bella was a freshman 18 years ago. She would have still been in high school when MC was born.
In the follow up post I made it clear that I believe Bella is not aware of this connection. I pointed out that since Miranda and Viv have not been a part of MC's life, Lynette's friends are not aware she had a son. They might not even be aware that she is dead.
The diary has only just gotten to the point where Lynette and Neil had sex for the first time. MC's birth is at minimum 9 months away. If they ran away together Lynette's death might not have been "local" to any of her friends. On top of that Lynette no longer lives in the house she grew up in. The new house may not be "local" to her friends either.
We know Lynette's parents hate MC's guts. How far would they go to spite him? Would they really feel a need to inform Lynette's friends that she is dead? If they more or less disowned Lynette when she ran away would they give a shit about her friends? They had both the means and a motive to keep Lynette's death a secret from her friends. No one was legally obligated to tell them about it. Apart from government officials Lynette's parents were not obligated to tell anyone of her death. The doctors were downright obliged not to tell anyone about it except government officials and her next of kin. If Lynette had made a will the people involved would have known, but she didn't so no one would.
Miranda and Viv (and Bella) would have to actively search for her to find out about her death. Some of the information should be publicly available, but what would inspire them to even start looking? Why would they suspect that something had happened?
A much bigger question is why didn't Neil try to contact Lynette's friends himself. Well maybe Lynette's parents told him they would see to those matters and then lied to him about how they took the news. Would Neil suspect them of lying about that? If he were to think back on it now he might, but would he have at the time?