FM, If I had to make this decision I would think long and hard about what it would be like for not only me but more importantly my kids to be stuck with this raving lunatic on a long car ride.
To me, it would be worth any amount of $$$ to send her crazy self-absorbed @$$ packing on an airplane so I could have a peaceful drive home and quality time with my children.
But, you know your finances better than I do.
Remember, the non-monetary price of her presence might be higher than the cost of the ticket, to all of you.
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver