Yzmas' previous owner had said she would occasionally fast in fall/winter. This is our first winter with her.
Since getting her in June, she has eagerly eaten once every Sunday for us. One rat usually between 120 grams and 130 grams. (We get as small as we can in medium. Small rats are waaaaay too small.)
At her weigh in last week, she was 1,940g.

Tonight was the first night that she has refused food. Nothing in her environment has changed - the hatchling ate with no issues tonight.

When do I next offer her a meal AND, if she refuses again, how often do I continue to offer? (I don't want to waste rats.)
She was out and looking for food and perked up when she smelled it but was disinterested when we offered it.

How often do fasts normally last?

Thanks.