When did the alleged overpayment occur? The rules for exempt work in Reg 17 of the Incapacity for Work regs changed significantly in April 2006. The requirement to notify DWP specifically of the change removed completely, though not the general duty to notify of any material changes (which would apply to IS and HB, with the increase in income).
If she was genuinely on IB (not IS), was within the earning limits at the time and the hours limit, and did not work for more than 52 weeks, all after 9.4.2006, then there has not apparently been any overpayment of IB. You would need to know why the DWP thinks there has, if so.
If any part of the period in dispute is before 10.4.2006, then there are other problems, mainly the requirement to give notice to DWP within 42 days of starting the work at the latest. This applies to IB. For IS, if the work could not be classified as exempt work she might no longer qualify for IS, unless she was in some other IS-able category such as a disabled worker.
If she was on IS, then she has the problem that her earnings, even if legitimate exempt work, are likely to reduce her IS entitlement and thus lead to an overpayment. Likewise the local authority benefits, whatever the nature of her earnings. If it was not exempt work, so that she was no longer incapable fo work, she would lose her disability premium. However the council should be encouraged, when you have worked out whether the work does count as exempt work, to consider underlying entitlement for the period. Just becasue she was/may not have been entield to IS/IB becasue of whatever, doesn't automatically mean she isn't entitled to HB/CTB at all, though you wouldn't know it from the way many councils respond.
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