For childminding she should contact her local council where they will advise her of training courses in her area - they are free and will include pediatric first aid training, registration with OFSTED and NCMA membership
If she is after a TA position I would suggest, that unless she already has relevant qualifications for it, she should get some. TA jobs go very quickly and are very much sought after positions
For other jobs in childcare this is a good site
http://www.childcarelink.gov.uk/
Start with a postcode search on the first page, enter postcode on the second then choose job search on the third
As for hospital children's ward? No idea about that one
Perhaps a nursing times or local jobs agency