SARS does allow you to claim medical expenditure you incur on behalf of your "dependent". Therefore if she's financially dependent on you, you could claim the expenses in your tax return. However, SARS might query why she is not a dependent on your medical aid and they may therefore disallow this claim if you are audited.
It is a tricky one and SARS can be difficult with medical expenses - however, If she is financially dependent on you (and you can prove this) you may be able to justify the claim to SARS.
Get SARS Tax Deadlines in your Inbox
We'll tell you when you need to file, along with tax tips and updates.