She may just not want you in her car b/c you may find something that she doesn't want you to see (re the carseat thing) -- that was my first thought -- not that she doesn't want you doing things for her.
Is she having an A that you know of? I would say she probably is.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10