Whilst you can do this for your busy sister, it cannot be done lon her behalf”. Just do it all in her name.
The above appeal wording will get this cancelled as long as the driver is not identified. Ther is no legal obligation on the Keeper to identify the driver to an unregulated private parking firm.
Make sure you do not select any options when using their appeal portal that admits the Keeper is also the driver. Only select options that the appellant is the keeper or “other”