Cruise Companion for a 73 year old lady

My mum is a 73 year old widow (young for her age) looking for a cruise
companion to accompany her on a cruise around the Mediterranean. She
enjoys cruising and has been around the Med, the Norwegian Fjords and
North America/Canada in the past, although I don't think she has any
specific holiday in mind. Her only considerations are affordability,
and the chance to travel with another lady of similar age. There must
be plenty of ladies out there in a similar position and so if anyone
reading this message knows of someone in a similar predicament then
please encourage them to get in contact. My mum is a lovely lady and
it's a shame to see her give up the chance of a holiday because its
too daunting or too expensive to go on her own. Please email me
. PS we live in Bristol in the UK.