It's always a worry when babies don't do what we expect them to
She's dropping on the charts, have you checked her against the WHO charts at all? She is still gaining weight, right? And how is she otherwise? No medical/health issues? Hitting milestones and otherwise ok?
There's a great book on feeding called "My child won't eat" by Carlos Gonzales. If you can get your hands on a copy of it I highly recommend it and you may find it rings some bells for you.
Breast milk offers way more calories and better source of nutrition than anything else at this age, so if she's gaining it's because of that, not the solids You're doing great, your baby most likely is just slowing down her growth - which is totally normal - and following her own curve.
If you're worried, you can talk to a doctor about how she's going or to look for other issues if you have concerns.