MARGARET HOLT Missing in Lanzarote since December 23rd

Please can you help. A family friend, Margaret Holt, left Hotel Barcelo in Costa Tegusie to go for a walk on December 23rd 2011. She hasn't been seen since. Her son Ben and his wife Clare, along with family, friends & local volunteers have been searching for her for the past 14 days...so far to no avail.
The Guardia Civil have ceased searching and won't resume until new clues come to light. This is where you come in. if you've recently returned from Lanzarote (or are in fact still there!) please check your photos/videos to see if there is someone matching Margaret's description (British lady, 65 yrs, very fit & capable, slim build, short, light brown hair) in the background. We're hoping she might appear (inadvertenly) in someone's snapshot, which would give the authorities a time/place to site her...and enough of a clue to start searching again.
Please help. I can't post 'links' here so can't take you directly to the news coverage of Margaret's disappearance, but just Google 'Margaret Holt missing in Lanzarote' for more information. Also, there's facebook page set up Margaret Holt missing in Lanzaropte.On the info section you'll find details of who to contact if you think you may have anything which could help. Or, please just contact the Guardia Civil
on: 0034 928.592.400, or Sandy Bart of local English-speaking radio station 'UK Away FM', on: 0034608343297 who is working hard to find Margaret.
Sharon Byrne...friend of Ben & Clare Riley

Please help us. Ben is desperate for news of his Mum and is exhausted with the strain. if you can hekp in any way, please do so.