Red ear slider poops white balls?

My baby is 3 years old, about 9.5 inches. No new habitat or food changes. Her poops are usually quite large and green/black, but two days ago I found these white soft balls that were at the bottom of the tank. They are not stringy or moving, which leads me to believe this is not a parasite. They are very squishy... show more My baby is 3 years old, about 9.5 inches. No new habitat or food changes. Her poops are usually quite large and green/black, but two days ago I found these white soft balls that were at the bottom of the tank. They are not stringy or moving, which leads me to believe this is not a parasite. They are very squishy and seem to have some sort of mucus around them. A friend told me he believes it’s an intestinal infection, and my boss believes it’s the start of her maturing. It is the weekend so I cannot bring her to a vet, and was wondering if anyone has dealt with this before, and what it could be? Thank you
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