My parakeet's poop is watery and runny? What should I do?

Okay so, I've had my parakeet for about 3 years and she has never had runny poop until she started laying eggs. I don't know what to do about, and I can't visit a vet because my mom doesn't let me. :( Is she sick or anything? I don't want my birdie to be ill or die... :'(