Thanks everyone for your responses. I sort of feel silly now for asking. I guess 2 and a half is still quite young. She has only just filled out in the past 6-7 months and shes looking really good. She has been doing obedience for quite some time, the funny thing is I thought "oh she knows her sit, stand drops, how hard can stacking be?"
OMG she looks terrible! We have alot of homework to do. Anyways thanks everyone.