By law, she has 14 weeks paid maternity leave. If they are pressuring her to go back to work after 8 weeks, they are breaking the law.
I would probably at this point call their bluff and propose a 'settlement' - 4 months paid maternity leave (which is 'insured' anyway, so it doesn't come from the employer's pocket) - plus three months salary in lieu of notice.
If she is indeed only one week prior to the birth of the baby, she should just go to see her doctor, tell the doctor that her employer is placing unreasonable demands on her, and get a doctor's certificate stating that she is on sick leave until XYZ (three weeks from now)...
They certainly cannot bully her whilst on maternity leave (please cut off all communication other than informing them of the birth date of the baby and sending them a copy of the medical certificate for sick leave via post) and she has to give notice according to her work contract (could be 3 months, could be 1 month) before the date of return, which is an exact date calculated from when the baby is born.
If she is 'due' next week, she could be having the baby tomorrow, or in three week's time...unless you have booked in a 'c-section'...
I worked right up to and beyond the due date of my third child... part of the reason why I think my baby was born so 'overdue' was that I was not psychologically ready/relaxed enough... I finished a few really important things, and he was born about 3 days later...