Welcome to our family!
Congrats on the new addition, and karma for you for taking the time to "borrow" a grey to try out. Quite unusual I might add, but to each his own. My heart goes out to the borrowed grey.
It is perfectly normal for your grey to be silent. Gosh, you've only had her for 2 days! :ohmy: It takes a long time for them to adjust to their new family, new surroundings, perhaps new toys, a cage, new sights and sounds, etc. Please give it time and be patient.
Greys will bite! So, don't put your face close to hers unless and until you have complete trust and are bonded with her. That takes TIME.....
If she wil step up with you, that's great! COntinue if she is willing, but let her take the lead and keep an eye on her body language.