yes, I'm often anaemic, esp in pregnancy and straight after birth and the best thing I have taken is spatone. you can buy it in boots or supermarkets and it's little sachets of iron rich water, you can mix it into orange juice (vit C makes your body absorb the iron better)
because it's water soluble you don't tend to get constipation as you would with iron tablets, so it's worth paying for IMO.
the other thing is oats. they can help boost supply and I think are a good source of iron too
btw, this early on, if she is replacing breastfeeds with formula that can also impact on her supply. if she wants to breastfeed exclusively then she needs to feed as often as possible to increase her supply. every bottle of formula she gives is like saying to her boobs, hmmm you don't need to make so much milk. whereas every time baby feeds, regardless of how much she takes, the message being sent is milk needed!!! make more!