My baby barely eats!

Tamara • Married to the most amazing man, have the most beautiful little girl and handsome baby boy. So completely happy with my life!!
My daughter is almost 9 months old and she hardly eats! She's offered breakfast, lunch and dinner and snacks! She'll snack on a few healthy vegetable crisps throughout the day but will only play with her main meals. She drinks plenty of water.
She's breastfed and will have milk 6/7 times a day but only for 10 minutes at the most.
She's putting on weight nicely, having lots of wet nappies and has a dirty nappy every 4 days. (Doctors aren't concerned about that).
Should I be concerned? How do I get her to eat more at meal times? We do BLW and have a variety of foods. She'll randomly pick but I'm worried she's not getting enough iron and fibre etc.