The front legs (tucked back) are what jumped out to me, but is that normal or just the photo or just sometimes? First thing is - is the horse sound? If so, don't panic!
But if that's their common stance I'd look into it with the vet - my 11yr old has been diagnosis with coffin joint arthritis and after a lot of investigation and collaboration by my vet, podiatrist and McTimoney pro, we believe his tucked in posture is the biggest factor and our main focus in the longer-term rehab. Hence me seeing it in the photo! Now my lad has a lot of issues (his postural habit is mostly on-off low level discomfort from really challenging metabolic issues) so this could be much simpler for yours, but just like us, if they stand a bit funny and move a little wonky then their joints will wear unevenly. So worth a check I would say, just to save an issue later.
I think it’s difficult to comment without context behind the photo- mine are often stood awkwardly having just scratched/ eating from a haynet/ stamping flies etc but then will move and look perfectly normal….equally will stand in the most bizarre ways if you’re trying to take confirmation/ sales photos!
If you’re seeing it all the time or stood in the middle of the stable always looking odd that’s different, or weight shifting from one leg to the other.
There is a phrase 'standing in a teacup' which refers to a horse standing with hind feet a little forward and fore feet a little back, usually to alleviate heel pain. Have a good look and see if there is any sign of thrush - dark, damp patches on an otherwise dry frog, shedding and fraying of the frog surface, sometimes a manure type smell, soft frog particularly at its widest point. Are the heel bulbs well developed and doing their job of shock absorbing? Is there a lot of hoof wall beyond the white line (unshod horse)? She looks nice. Agree there is a bit more weight to come off, but you are doing well.
My old arthritis boy stood like this when his hocks were playing him up, but he looked visibly uncomfortable. I don't think your pony does.
I think it's probably as simple as carrying extra weight so balancing more over the front end while resting a leg behind. I bet if you stood her up properly square she wouldn't stand that way. And you'll probably find as she looses a few pounds she won't feel the need to counter balance like that.
She's a lucky girl to have someone looking out for her like you are.
Could be a few this - mine shifts a lot if he is uncomfortable in his feet. He also rests his leg more often if his arthritis in his hock is bothering him. He also just generally rests his hinds which he's always done.
Regarding the front - could be heel pain as others have said or toe is a bit long.