They are pretty scared when they are young. don't worry, its not your face
Just hold her alot and give her treats. they like just about everything. but, a piece of raw corn on the cob is a favorite. also gren peas, lettuce,nuts. just not really good to give then sweets or salty things. talk to her. they LOVE that.!!!! and tell her how smart she is, treat a rat smart and they will be, treat them dumb and they will be.
put her on your shoulder and walk around with her. also, if you want to sit and watch t.v. or sit somewhere on the bed or something. they feel safe when they are under cover. so what I did was have a small kitchen towel,place it over the top of my thighs and make like a "tent" for them. soon, they get curious and come out slowly and run back under when they feel the need to feel safe. a towel to run under, is a good thing.
also have a little "house" for her in the cage. this is their "safe" place. try to get her out with treats and once she gets to know you, she will come out on her own. try not to put your hands in there, because it is no longer a "safe" place, when hands are reaaching in.
Let me know how things develop.
when rats are scared, the instinct is to poop. don't worry, once she gets to know you and love you, she will not do that on you anymore.
Jan