Convict Cichilid behavior?

So I got my convict awhile back and she didn't start acting like this till this month. She was also still considered a baby too and she has grown a lot in the short time I've had her but she has started digging up the gravel in her little territory of the tank. I read where cichilids are known to dig but she is digging holes straight down to the glass!!! Is this normal and why is she doing it? She will also do this and act real defensive of her hole for a few days and then act like it never happened. I've also noticed when she does this her butt gets a tad bloated. Could this be fish puberty? Why is my fish weird???? lol