I've just realised that my 6 months mat leave is up on the 18th (I am taking a year though). My problem is that my manager asked me to write a letter requesting 6 months. She said that she would write to me a month prior to this date to discuss it but I haven't heard from her. I've tried leaving a message but haven't heard back, what should I do? I'm really worried that I'll be expected to go back on this date and that it's my fault.