No worries! A couple of extras I forgot to add:

www.chathamhouse.org/about-us/car...
smartthinkingjobs.co.uk

Hope she finds something :)

Hi, this got reposted onto my timeline. These might be of interest? Council websites will probably have a jobs page too. Apologies if she's already seen them.
ngorecruitment.com
www.civilservicejobs.service.gov.uk
w4mp.org
jobs.thirdsector.co.uk
jobs.localgov.co.uk
www.local.gov.uk/recruitment