It depends on her contract, but under English law, she would be entitled only to statutory redundancy (e.g. what the UK government pays) unless her contract stipulates otherwise. Look at
www.direct.gov.co.uk and redundancy, but I cut and pasted this:
0.5 weeks pay for each full year of service where your age was under 22
1 weeks pay for each full year of service where your age was 22 - 41
1.5 weeks pay for each full year of service where your age was 41 or above
so, if you mum is 60 (sorry, just guessing!), she would be entitled to 8x1.5 or 12wks upto 400-450 per week....
hope that helps - have her check her contract and see if there are any provisions beyond that!
(I trained as a solicitor in Ireland, but never qualified (too boring (for me!))
best wishes