Flavia Tumwijukye, 51, who had lived in the UK for 10 years, died after being in collision with the motorcycle on Friday in Edinburgh.
She was described as a tireless campaigner with a passion for education in her home community, where she had set up two schools.
The family said she was a "daughter, sister, aunty, grandmother and friend to so many people in UK and Uganda in East Africa.
"Flavia met her untimely death while on her visit to Edinburgh, a city she loved and has visited before for the Fringe Festival and Edinburgh Tattoo.
"Her death has left a great void in the lives of so many."
She had been attending college in London and worked part time at South Mead Hospital, Bristol where colleagues called her 'Mama Pam', and said she was a "kind and generous lady".
They continued: "She has been described by the families of the people she extended kindness to as a Ugandan Mama Teresa.
"The Uganda government will remember her as a good citizen and practising Christian who with her little salary is credited for having founded and built two schools for orphans."
Figures emerged yesterday showing more than one-third of pedestrian road deaths in Scotland in 2012 were clustered in an area half the size of Arran.