Also, how long has she worked for the company? Depending on how long she has been with them, she will have a certain amount of notice period that she's entitled to (the below is the minimum, she may be entitled to more in her contract)
2-5 years service - 2 weeks notice
5-10 years service - 4 weeks notice
10-15 years service - 6 weeks notice
15+ years service - 8 weeks notice
If they're not making the announcements until January, and she has a few weeks notice period, she could find that she's able to take her Maternity Leave prior to the redundancy taking effect, and thereby preserving her Maternity Benefit entitlement.