Here is our first egg of the day lol I came in because of the weather, but...as you can see, super light creamish color. From a BA as I watched her drop it while I was checking on our hatching chicks under Mama
When did she start laying? I'd give her a few weeks. She may just have off white eggs. Here's a random selection from our girls (Australorp/Orpington/Brahma/olive egger) to give you an idea. But I will watch ours in the morning and snag some BA eggs for reference that her shades may just be...
Do you happen to have any photos? Of her or her egg?
Our BA s laid lighter colored eggs (and some funky ones, double yolk, shell less) for the first few (4-6 weeks) until they evened out. Even now some are more tan or cream than brown