Simply because one is exposed to Ebola does not mean they will contract Ebola.
One person could get a single drop of Ebola tainted blood on their face and be infected while another could have a bucket of Ebola blood dumped on their head and not get infected.
I would not try that test at home.
Where is the GF from? Is she from Africa, could she have already been exposed to Ebola? Immune to it? or not develop the infection? Same with all viruses, a good portion of the population never gets sick after exposure.