Re: Supply dip during period, what to do?
The best thing you can do is to nurse on demand, even if that means your baby is acting super-fussy. If she's not getting enough during the period of your period, nurse her as much as possible and then give her some solids. Galactogogues and a Ca/Mg supplement won't hurt and may help, and pumping during the workday will definitely help (but don't feel like that means you have to do it!!!).
It's entirely normal for pump output to decline at this point. Your baby is eating solids, and therefore less reliant on your milk. And you've quit pumping at work. So if you were pumping the same amount at 12 months that you were at, say, 8 months, I'd be surprised!
If you want to pump and your baby won't drink your milk, you could always mix it with solids. Use it to thin out cereal or purée or something. But please don't feel like pumping is mandatory at >1 year! It's an option that works for some moms, but for most moms it's above and beyond the call of duty.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"