Can you determine a cross breed's parents?

[ChickenPollo]

Hi. I was curious about whether you can determine what breed the parents of a hybrid are. This is because I have a hen that loos like a Penedescana but lays white eggs instead of brown eggs. Does this mean that she is a cross breed, and if so, how can the parents be determined? Thanks.

 

[AustralorpsAU]

Could you possibly post a picture?

 

[ChickenPollo]

Could you possibly post a picture?

i have the pictures but they won't upload!

 

[ChickenPollo]

Here is the thread where I have pictures of that hen (it's the brown one) https://www.backyardchickens.com/t/1121174/what-breed-are-my-hens#post_17284563