She definately has that "I'm not goin' to no vet attitude"! She's lucky to have you take such good care of her! Best of luck at the budgie doctor. If only our birds knew we put them through things like this because we love them so much.
I'm confused as to why the situation was left so long.
Why didn't the breeder you got the budgie from take care of the splayed leg problem as soon as it was noticed?
The sooner a problem of this nature is noticed and dealt with, the better the chances of the issue being corrected.