^ If she's eating heaps of solids she should be right, someone once told me that Step 1 and Step 2 were exactly the same thing, just Step 2 has a bigger scoop to help their growing bellies get fuller (and pack in more nutrients) if they're not eating heaps of solids, kwim?? So really Step 1 should do the trick if she's taken to solids really well (and it sounds like she has ).
Hope it all gets sorted for her soon hun, poor little bubba, it's no fun sitting there watching them in pain and feeling powerless to help, is it? Big hugs for you Em, you're doing such a great job