Lavender is Black, just diluted. The bird being grey doesn't indicate a Lavender Orpington as the dam. Quite frankly without all of the details and possible parents there's no way anyone can pinpoint the combination that yielded that particular hen. I think it's rather clear that the Polish...
Again with not giving all the information needed.
1. All your birds were together.
2. You pulled the Silver-laced Polish male and two Lavender Orpingtons and one Buff Orpington hen and put them in a breed pen?
3. You waited a week and started setting eggs, so the hens could still have...
Okay, outline this in complete sentences and with detail please. I have a headache and that first post was hard to follow. You have the hen in the photos and you'd like to recreate her. You know for certain the dam was a Lavender Orpington? Something about a Silver-laced Wyandotte cockerel...