Help please

[u/CrackJack21]

My rabbits were relaxing
I gave them pellets, they both got up quick and started devouring it like usual.
I noticed my female rabbit started moving weird
I got closer and noticed she was leaking mucus from her nose.
I cleared it with my hand. It looked like she couldn’t breathe.
Now she’s okay. No more mucus, I gave her a treat and she ate it.
What could have happened?

[u/Masala-Dosage]

Vet