Seven eggs today!

I haven't posted here in ages bc I've only been getting one, two, or at most three eggs a day. I've been giving supplemental light for about 3 weeks now, since everyone mostly finished molting, and it appears they're starting to pick up production, so hooray! So far I'm getting two that appear to be pullet eggs, they're small ... but one of those is quite dark, as if it's from my Blue Copper Marans. She's at least two years old, maybe 3 ...
Do older hens sometimes start out the laying season laying small eggs like this? The only pullets I have are BA (medium brown eggs) and black Ameraucanas (blue eggs),.so ... I guess it has to be hers. But it seems odd she would lay such a small one. Ideas, anyone?