depends on you club, and the pathway they have chosen. OOA could mean OOA compulsories (intensive), National (medium) or even regional ( basically not much more than rec). A OOA complusory gymnast would probably be working more than an In Age Regional gymnast.
The thing I think is not to stress too much about it, most of us just go with the flow as we have no say in the hours each gymnast will eventually train, the only options we really have if we don't agree is to switch gyms.
So many things will change over her time in gym you can't second guess where it will end.
Check out the sticky threads in the UK forum for more info, its all as clear as mud.
'Margo