When a Council, or private organisation, erects CCTV in a public place, they are obliged to inform people that CCTV is present, and why it is being used. Normally this results in a sign saying "CCTV is used in this area for the purposes of crime prevention and public safety". I very much doubt that they added "...and for the puerile entertainment of Channel 4 viewers".
The only legitimate uses for the video recorded of this woman are to support her prosecution for public order offences, and/or as evidence to recover costs for cleaning/repairing the lift etc. So although complaining to Ofcom did not help, she can still take legal action against the CCTV operators.
Next week on Channel 4: "Soap stars who once scratched their arse in public twenty years before they were famous"