‘Immature’ speech sounds/sounding different to peers in 6 year old DD

[Speech41]

My 6 year old daughter has what I would call immature sounding speech. Not the content but how she actually sounds when she speaks. She had issues with her R sounds but that has now came along with age.
it’s hard to explain, it’s not an accent exactly but she definitely says words differently to how everyone else does and when corrected she struggles to say them the ‘right’ way. We did go to speech and language and she suggested it was ‘youtube’ which she doesn’t even watch. No other diagnosis or behavioural issues it’s just how the words sound coming out. Can anyone offer any advice?

We had this and went to slt when she was 4, 5, and 6. Got a block of therapy at 5 and 6 to address the sounds she couldn’t make. still can’t say a couple they said would come in time. Her voice is high with no regional accent. Been to ent too who told me she has a very small larynx which will grow in time. Or maybe more slt when she is bothered by it. I do wonder she will be in high school soon and does sound very different.

Yes that’s my worry as she sounds very different to her peers/siblins. I actually can’t even exactly pinpoint a specific letter sound except maybe her A mid word but it’s just different. And I know it’s not from watching YouTube as suggested

No one outside the family has ever commented to me. No one teases her at school. She herself is completely unbothered.

Yes no one has commented either except when she wasn’t getting her R sounds as that was very obvious and I don’t want to make a massive deal of it if she’s not bothered

A step kid in my very extended family had a really odd way of speaking. It was generated by watching too many cartoon shows on telly.
Cut the screen time.

we are a very limited screen time family, no tablets, phones, no YouTube etc. it’s not an accent, it’s how she forms and says her words

I'm surprised by the comments from the SLT. How does she do on this simple 6 year SLT progress checker?