I'm not quite understanding why a portable potty doesn't work. We have a potty potiet.(not sure if I spelled that right) but it folds really small and has these little bags with an absorbable pad built into the bag so nothing slouches around. You could put it right on the front seat. Maybe put a changing pad under it if you wanted to be super safe. Just tie up the bag when shes done and toss it in the trash at your destination.I have 5 little ones in 5 car seats in a crowed van and my kids use it all the time. I keep it in bag, with wipes and a liner on it, ready to go. I go no where without it. You can get it at babies r us.
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