These included disability living allowance and carers' allowance, as well as child tax credits claimed by falsely saying other children were living with her.
At the same time, another 20, 000 carers will be newly awarded an allowance as a result of the PIP reassessment - meaning a net total of 5, 000 carers who will miss out.
Disability living allowance, however, is expected to remain separate, with the new system allowing carers to take part-time or short-term work without losing their benefits.