looks just like my TB when i got him, the belly i would attribute to neglect, they get big hay bellies from eating all day and no excersize. She`s efinately a pretty girl, and lucky you found her. It`s highly regular to have a tb that age and size, you have to realise due to high grain intake and breed modification TB`s stop growing around 2-3, as warmbloods and QH`s stop at 4-5. That`s how they race them so young, they`re already finished developing. It`s definately not natural yes, but keep in mind it is a purely man made breed. It wouldn`t hurt to have some fecal testing and blood work to make sure the hay belly isn`t bloating due to ulcers or parasite content, both of which are extremely common in TBs and can be very painful.
If something is not to your liking, change your liking- the only thing you can count on in this world is change. ♥