Just an idea: Have your tried switching vehicles and use your phone in her car and her phone in your car? Do you get the same results? I know my wife cannot hear me very well if I am talking thru Sync in my 09 Focus while moving. Her 2010 Fusion has no problem, but we have different phones also. I have not tried the switch myself, I just know that some phones are much better than others and that may be the culprit.
K&N Air filter, uh - thats it, NO CAI, NO FSWerks, NO Exhaust, NO Coilovers, NO Tune, Nothing