notarized letter

crossing central america with notarized letter.

Hi all.

My name is Ariel. 

my girlfriend an I left montreal on dec 2016.

and right now we are in panama, bocas del toro.

the car is under her name (sins we boght it in montreal and Im from israel),

I was looking a lot on the web for information related to crossing all the borders around in central america (from mexico to panama) because we separated for 4 month and I didnt want to get stuck in mexico with the car, unable to drive out.