The £5million won't be just her lost earnings
It will be made up of money spent so far (physio, OT, SLT if needed), money to be spent, lifetime of physio (£40 a session, maybe weekly for life) OT etc. Any equipment needed, including cars maybe even drivers. Any house adaptions needed or purchasing new adapted property, even personal hygiene is costed, 6 weekly trips to get waxed and nails cut, down to the last penny. Also any future carers/cleaners needed to run a home will be costed. It will also take into account all ages (so an 80 year old disabled person may need more care than a 20 year old, also costed to the penny and allowing for inflation)
Having been through this for my child, you have the 2 sides of solicitors. Your set works out a figure that is very high for future needs, the hospital trust side works out a very low figure. If you settle before trial it lands in the middle somewhere (this is when the hospital trust admits liability, if they don't you first need a trial to decide that) IF you don't come to an agreement, a trial takes place and a judge decides on the amount. A judge also has to agree the final figure in court, even if it is all agreed. I doubt who she is made any difference
I don't care how she got her injury in the first place and I don't care who she is. IF she has been through the mindfield process of sueing and proved negligence, she deserves every penny