Guest House in Johannesburg c.1900

[jerper]

Hello,
Can any one help with finding information on a Annie Cross b.1871 in Truro Corwall England, who emmigrated to South Africa around 1900? Apparently she set up a Guest House in Johannesburg and had 2 daughters and 1 son.
This information I read from a letter my fathers aunt had written some forty years ago Any information would be gratefully received.
Regards
John Pearl