thanks for the replies i will start feeding a large rat every 10 to 14 days i will see how she does.
thing was with the large every week on the third week she would normally refuse to eat then i was left with a rat.
i kind of thought every week might be a little to much .
Trial & error my friend. Start with one large every two weeks & just watch how she's putting on weigh. If she's gaining too much weight then just bump her to every three weeks until you figure out what schedule works for her.