If it's on your person, then you're ok. Of course, if there's a pda and her hand is resting on your hip, beside the firearm... well, ya never know what some anti-gun cop or DA will decide.
If it's in the glove box when she's a passenger, then you aren't ok, unless the glove box is locked. Of course if the key to the glove box is on your keyring, in the ignition, within her reach -- does that constitute access? Dunno.
If you are contacted by police, and they run both your IDs, her felony status and your gun possession will not make them happy -- thus they will then look for ways to screw with you imho.
She should pursue getting her record expunged. A quick google search turned up http://www.washrecord.com/
Be sure to thank both liberals and conservatives for unjustly depriving her of her inalienable rights.