cobgoblin
Bugrit! Millennium hand and shrimp.
Sadly yes, but as mentioned, she’s a real late bloomer. When I first saw her I thought she was about 2! She’s a rescue and had a poor start, so hasn’t filled out yet, very narrow etc. I think she will be a heavy weight in time, but perhaps 3 years away yet.
What sort of cob is she?
Is she a show type? A cobby cross? A traditional hairy?
If traditional, is she the modern type with a small pretty head, or the vanner type with a head like a brick at this age? The modern ones don't tend to grow much and just fill out after about 14hh, but the vanners do continue to grow.
Measure her bone as suggested above. You want good flat bone with a strong tendon behind, ie much wider from the side than front or back.
The other thing to consider is length of back for a saddle, which is often very short on a cob. So measure what size saddle you need.