She will stop eating as much and her mouth will appear bigger. Depending on how large the babies are, you might be able to see them if you get the chance to look in her mouth. It is sometimes hard to notice. The first couple of times ours had some we did not know until we spotted the tiny little...
We had a similar experience but the fish were the same type. I know some fish are able to undergo physical changes when ready to mate and I believe that is what happened. The female will store the babies in her mouth until they are developed enough. The "kissing" can be anything from aggression...
I had a flock of 4 chickens and my sister was unable to keep one of hers so she gave her to me. However, the 4 I had were quite aggressive and the new addition was rather docile. I have not been able to integrate her properly so I have had her separated with one of the nicer hens from the...