Keeping them outside the whole day long is a bit risky, considering the fact that she's still a baby. There are so many horror stories of birds being caught by cats, stolen by thieves, etc. Large birds especially are stolen a lot as they are worth a lot of money.
The cage itself is on the smaller side, but if she gets a lot of time outside it shouldn't be an issue.
Just some advice of "decorations", you need to get a lot of toys she can destroy, natural materials are the best. I also recommend natural perches(if they are a safe wood of course) as they are a lot better for their feet than the smooth dowel/plastic perches that often come with cages, and they provide a lot of mental stimulation as well since birds can chew on them.
Avoid painted toys, cotton rope(the perches are fine if they don't chew it), plastic bowls(unless you have no other choice but you'll need to thoroughly clean if every time), sandpaper perches, mirrors, etc etc(I can give more info as to why these are bad if you want me to).