An increase of solids also asks for an increase of water intake.
I always found kiwi works great, but make sure to discontinue the use of banana and pear juice can be a good one too.
Also belly massage (clock wise around the belly button) can be very helpful

Infant’s Friend may help but I’d talk to the chemist. My daughter had it once but as a primary school age child- there was a drink I was able to get her but not sure if suitable for babies. I do remember my kids made hard little marbles when first starting solids but it went away on its own.

A little prune juice or some kiwi fruit should help.

Prune juice – we found about a teaspoon a day was usually enough.

It probably is adjustment. Try giving her a little prune juice – not much, about a teaspoon full a day. Worked a treat with my son.

Try pear or pear juice it’s a great natural remedy.