What breed is my ameracuana mix chick mixed with?

[Kennas_Kritters]

I hatched out this cutie yesterday! Her dad is a Ameraucana (I think the blue wheaten) the mom is either BR or R.I.R.... what do y'all think it's mixed with? I know crossing ameracuanas with BR or R.I.R can also make sex link so is it maybe a blue sex link? It has a very faint yellow spot on its head that you can barely see. I'm not sure at all so I came here I think it's a BR mix but I would like to know if I accidentally bred a sex link?

 

[EmmaRainboe]

I believe I see a barring spot. Which would mean BR mother. And would also mean it is a sex link, and is male.