Would you seek advice?

[TeslaGirls]

I'm unsure so asking here first

DD2 is nearly 13, a very clever girl (top sets selective school) and is too chatty. However, here are my worries. She is really small for her age, always has been - it was investigated when she was a toddler as she dropped off the centile charts when she didn't grow for a year. No cause found. We just accepted that she was small for her age and would catch up one day - except she hasn't.

Added to that, is my increasing worry that she is so immature compared to her peers - as in she'll cry over absolutely anything, and I mean real snotty tears. I think it's mainly when she doesn't feel confident in something, but I was watching her last night with another adult and it was heartbreaking to see her sobbing over something which wasn't really a big deal - even she admitted it wasn't.

I have a couple of autoimmune disorders and DD1 has fairly significant health issues so DD2 was always considered the healthy one. Except now I'm thinking maybe not as she grows in age but not height or maturity. I'm unsure as to whether to bother the GP, but it is actually getting worse not better.

Fir reference, she has grown 2cm this past 18 month.

I’d potentially seek advice, in terms of her peers how close to puberty do you think DD is? It can of course rang from an early age to 16/17 however say for instance she has hormones suppressing her growth it would be good to explore this sooner rather than later.
I’d personally go back to the GP, at her age I’d expect more than 2cm growth in height in 18 months

Thanks for replying maternity I don't think she's anywhere near puberty - I started my periods at 9 so I'd assumed she'd be similar, DD1 was fairly but early as well - but DD2 still looks, and behaves, like a young kid - crop top vests not bras, no underarm hair etc.