My texel, Evangeline, was like that, she would try to nip when being groomed (unfortunate for a texel!) and would hate to be blow dried. I used to groom her every day, but quickly and effieciently, without messing around. I used to wrap her in a tea towel so that her head was covered and just get on with it. I did not use the hair dryer unless it was really so bitterly cold that I worried she would catch a chill.
I think your piggie is trying to tell you she is unhappy with what you are doing, she is trying to communicate with you. I'm sure you are only "tapping her nose" gently but its worth remembering that guinea pigs do not seem to understand physical punishment and its more likely to make her more nervous of you and the whole procedure, than to improve her behavior.
Have you thought of trimming all her fur short, to save the worry and daily battle?