Here's a little update... We're currently on week two without antibiotics, but she's still coughing occasionally so I do expect the pneumonia to reoccur. Next time we'll get different antibiotics, I had a feeling the ones they gave us this time could barely keep the infection away. The ones we used the first time worked much better. If the pneumonia returns it will probably be because the antibiotics didn't work as good as we hoped, not because of aspiration, she didn't aspirate anything for the last two weeks, at least not that I know of.
The thickening of food and water works perfectly, I use corn starch to thicken all of her liquids and I supplement some of the water with thick probiotic yogurt. Brina is slowly getting used to the idea of no regular water ever, it's kinda weird for her, but that's probably because she's used to fresh water being always in a big water bowl in my room for both dogs. I had to take that away and put one smaller bowl in Jaka's crate which stays closed through the day and I just let Jaka go in for a drink a couple of times a day. Brina gets her thickened water separately, I asked the vet how much liquids does a dog need every day so I measure her liquid intake to make sure she wouldn't dehydrate. But it really works, she stopped inhaling bits of water, so thanks again for this brilliant idea!
I've also made changes to her diet, we've tried raw, but after a while it stopped working for her. Her digestion just never adjusted to the new diet, if she didn't have massive bouts of diarrhea, she didn't poop for a week (and no, I'm not kidding, she went from 3-4 days of no poop to a whole week). It's probably because I couldn't feed her as much bone as she'd need, I did supplement with pure bone meal, but bones are needed to help with digestion, not just for calcium. But a dog who aspirates things easily and doesn't really have much teeth left is not a dog who would be able to eat bones on a regular basis. So right now she's on a small amount of grain free kibble mixed with cooked meat and veggies (she gets some liquids from her food also). It works perfectly for her.
Oh and I will continue with supplements for improving the immune system, right now she's on echinacea purpurea.
I'm optimistic that with the changes we've made we will be able to at least prolong the time between pneumonias, if not completely prevent them over time