an ill female health worker is being treated for ebola on friday .
she 's been admitted to canberra hospital after returning from west africa .
the unnamed woman was working at an ebola treatment clinic in liberia .
it 's understood the woman did not treat any cases of ebola overseas .
she 's being treated in isolation under the hospital 's ebola protocol .
the results of the ebola test are expected to be known within 72 hours .