Hi, I also have two 20 month old English Bulldogs, and they are both trained to potty outside and crate trained. I don't have any experience with peeing in the crate, but we also don't give our guys any water after 8:00 or 9:00 pm, and they go out for their last pee at around 11:00 or 11:30 pm. They eat at 6:00 am and 6:00 pm, and have free access to water throughout the day, but after 8:00 we take their water away, and they have never had an accident in their crate, and they don't bark or whine to go out until 6:00 am. Does your dog drink lots of water in the evening? If she does, she may not be able to hold for the whole night, and taking away her water in the evening might help.