I should clarify: if you mother dies within 8 years (I think), then anything she's given away will be subject to some degre of inheritance tax, restropectively. Up to �3k pa will be tax free.
The recipient will be subject to capital gains tax once they pass the CG threshold (about �9k, currently, I think)
If you're talking a lot of money here, she should go and get some tax advice on the most effective way to give it. No sense in sharing it if you don't have to ;-)