Vanessa Young and Claire Topham are taking on the gruelling challenge for Spinal Research.
The Brazilian-Portuguese national was found dead by mountain rescuers.
The pair say they will re-attempt the climb in the future after failing to reach the summit.
A father who has been diagnosed with Parkinson's disease made the ascent with his son for charity.
Chris Linnitt is preparing to scale Mont Blanc 22 years after he was in a serious motorbike crash.
Reece Henderson, Daniel Heywood and James Raynor are walking from Mont Blanc to the Matterhorn.
A wall of snow hit a group near Mont Blanc in south-eastern France.
The woman was hiking with two other people on Mont Blanc's Argentière Glacier, say French police.
Andrew Wilkinson, of Fownhope, died in a climbing accident earlier this month, an inquest concludes.
