Cat Preference: Long Drive or Long Time Alone?

My cat was caught in a Havahart trap as a lone kitten. She's never really gelled with other cats, and she's afraid of all other humans but me. She always hides for the first day of visitors, and after that will only come out occasionally while keeping her distance. She hides whenever anymore comes to the door (even the mailman), and runs from me if she thinks I'm going to try to touch her.

When I went abroad for a workweek this winter, I had her sitter (who knows her hiding spots) come twice to check on her. I didn't bother with more visits because she honestly would prefer not to see the sitter. When I got home, she was a little greasy like she hadn't left her hiding spot all week. Basically, she didn't get any socialization despite the sitter's attempts. Normally when I travel I take her with me - she's good in the car and is fine in new places as long as she doesn't have to be around other people. The drives are usually about 10 hours, with a minimum of two nights at the location in between.

So, my dilemma that I need your help with is: this summer, when I take a nearly-two-week trip that will require three 8-10 hour days of driving each way, do I take her with me, or do I leave her home alone and have the pet sitter come every couple days?

I'd rather take her with me, because I like her company, but I want to do whatever will be best for her. I even considered flying so I could leave her home and be gone for less time, but it would change the nature of the trip, which I don't want to do.

I have a road trip kitty.,. if you have taken her on trips before and she has done okay, I think that she will be fine being cooped up in the car for those amounts of time.  Not much different really than being stuck in her hiding spot.  Is she leash trained?  Our road trip kitties get to stretch their legs because they do awesome on a harness... and our deaf kitty is comforted by both the harness when she is not in her carrier, and by her carrier when she is in unfamiliar surroundings.  But, honestly, in the car - Puffy sleeps like a baby and Tati is the every inquisitive toddler old bouncing on the seat... are were there yet?  Great fun.  We have even planned our upcoming vacation around being able to take them with us! Have a great time

You said she is good in the car, fine with new places, and you'd rather take her with you.  Seems like you answered you own question, especially since she didn't seem to do as well alone with just a sitter popping in a couple times.  Sounds like she's a one-person cat and belongs with you.