kake00 you must do what is right for you and your baby, there's no magic formula that works for all babies and the nurse can give you advice but she doesn't know your baby.
I say this every time a mum brings this up on here but don't pay too much attention to the line/percentiles, it's just one tool to tell if your baby is happy and healthy and should be looked at alongside behaviour, happiness, sleep, development and feeding.
Solids should be introduced slowly alongside milk feeds, like anything your baby does it takes time for your baby's digestive system to mature to the point where she will start getting benefit from the solids. It takes months for them to learn to walk so we cannot expect their digestive system to go from getting all their nutrition from milk to getting it all from a solid meal in a few weeks.
Go with your instincts and what your baby needs.