Welcome to the Parrot Forums and a very big 'Thank-You' for bring a special needs Parrot into your home. Love is never so deep as when it is returned from a special needs Parrot.
There is a ton of information available on the Web under the search structure for: Special Needs Birds and Handicapped Birds. There are any number hits that will go it to depth of setting up a cage to methods of handling, etc, etc, etc......
I would recommend that you visit our CAG Forum and also the special topic Forums that will cover any number of questions that you may have.
The Forums and the membership can provide a wealth of information regarding living with and loving your CAG. So, specific questions will get the fastest responses.
If you have not yet set-up a visit to your Avian Vet, please plan that for the near future. Your Avian Vet can advise you on specific needs of your girl regarding her handicap. This is very important since a loss of a leg and to what extent can vary greatly. While you are there, please have a new Parrot examination completed including a full blood spectrum test. This will establish a base line for her that will prove to be important should you find the need to be rushing to your Avian Vet with a very sick Parrot.
She will need to use her bill far more than other Parrots to control and help guide her get around. So, it will be important for you understand her need for first holding onto your finger with her bill as part of a Step-Up command. She will also use her wings to create lift to help with getting around. The more you 'with care' involve yourself and your family with her safe transfer and transport the happier everyone will be.
Again, Thank-You for joining our group and a bigger Thank-You, for bringing a special needs Parrot into your live!