milly - keep offering as much boob as she'll take - it's still the absolute best food she can have for the time being

and as for foods, I second the points made by starangelk and hoti.

DS also took a while to "get it" and transition from food being a really cool, mooshable, spreadable, shove-up-the-nose-able toy, to realising it filled up his little belly and is awesome!

And now he litterally eats more than me some meals ... I swear there is a tardis or a porthole of something in his oesophagas sometimes ...

But just keep checking the number of wet and dirty nappies, how well is she playing and sleeping, and let your gut (excuse the pun) guide you