Because her fiancé, Mike Branford, has been diagnosed with leukaemia and is in desperate need of a bone marrow transplant - which Kate is determined to find for him.
Kate, 31, had met Mike, 29, in 2009 and he proposed in December 2013, three weeks before she was due to go backpacking for six months, on a moonlit walk in Porlock, Exmoor during their last weekend together.
However, while she was in Burma, she received a phone call with the devastating news.
After she'd left, Mike had begun to feel exhausted and to experience night sweats. Tests had confirmed he had a vicious strain of the blood cancer called Philadelphia+.
Kate said: "It was like an almighty smack to the body."
She immediately returned home to Bristol. Mike began chemotherapy but his real chance to survival is in a bone marrow transplant, which the doctors hope to take place in 60 days.
But after Mike's three brothers proved not to be a match, is now determined to find a bone marrow donor for the man she loves through the Anthony Nolan register.
She said: "At least twenty of our friends joined the Anthony Nolan donor register straight away. Any one of them could be a match for someone like Mike who needs a donor. It's so easy and straightforward to sign up."
The couple are asking people to get involved in the #Shake4mike campaign, based on Mike's love of a shaky face photo. For more information, visit anthonynolan.org.
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