She is going to have to be patient and try various venues: Depending on the country, between the age of 60 and 70, there are about 83 men for every 100 women.
https://ourworldindata.org/gender-ratio
I saw it first hand when my mother passed away. My father was 61 at the time and the onslaught began almost immediately: a phalanx of multi-racial Scythian/Saka warrior women bearing condolences, food and "support".
She needs to try all the avenues mentioned above plus start the journey regardless, including volunteering in specific areas...get a computer and get busy!
Last bit of advice: she should never, ever (and this was from my Dad) mention she is looking a "mate". That will happen when it does. My father remarried at 64 to a women he met through work. Same basic age, same interests.