Often a rabbit carrying some pathogen will become symptomatic when stressed, which would certainly include pregnancy, kindling, and a cage change. Rabbits do get runny noses from causes other than snuffles, but I'd watch her closely, and probably keep her away from other rabbits just in case (not including her babies, of course).
I haven't seen any respiratory issues in my barn in years (I generally don't keep rabbits that get sick in the breeding lineup), and I don't believe I've ever had snuffles aka pasteurellosis here. But when I used to see a runny nose or any other respiratory issue, I usually grabbed the VetRx. To use VetRx, clean the rabbit's nose if needed, then put a drop in each nostril 1-2x daily, plus a few drops in the water bottle. If you hold the rabbit securely, it doesn't seem to mind too much, though it may be inclined to sneeze. Sometimes we also added grapefruit seed extract (GSE) to the water, but use that judiciously, both because it's very bitter and you don't want the rabbit to stop drinking, and because if you use it too long it seems to be more harmful than helpful. We thought we were seeing possible reproductive issues with extended use, although GSE is supposed to be helpful for reproduction. So, we used the VetRx for a week or two, but the GSE for only 2-3 days - about 2 drops in 16 ounces of water. I'm not actually sure how it works since the oil tends to sit on top of the water... so I usually just go with the VetRx.
Here's a site which talks about treating snuffles when you can't find and/or can't afford a vet:
https://afterthoughtsblog.net/2013/11/treating-rabbit-snuffles-without-vet.html/
I appreciate her experiences, as I am of the same mind regarding vets and rabbits. Fortunately, like I said, I have not dealt with snuffles, but much of what she uses works for my rabbits with any respiratory issues.
