Hi Andover,
If you are still mulling things over I thought I'd let you know that your daughter deosn't have to have A level maths for science, I know as my duaghter doesn't, she didn't even take A level Maths, and was accepted at Kings College London for Science. If your daughter is interested in sciencea dn health, why not point her in the direction of doing a Health and Social Science course AVCE, it woul dhelp her get a job in either social work, or any of the broader health positions, and if she liked it she could go on and take a degree in it. If not then why doesn't she look at working away from home on a nursing course at a hospital, it's not like it used to be and in fact there are now nursing degrees, after which she could go on and do a nursing practitioner's degree, all of which she would be paid to do, get on the job training and be away from home so that she gained independence.
Good luck