I agree, it is a female...female budgies generally bite and bite hard. lol
Swings are great for budgies - if dowel, try and replace it with a safe natural perch.
Ours all love a small amount of hay - they enjoy taking it onto a perch and chewing it for ages.
Budgies also love greens, corn on the cob, apple, carrot, sprouted seed, celery, sweet potato, peas, romaine lettuce, dandelion leaves and parsley occasionally...
Please don't have any mirrors in their cage - they can become fixated with the 'reflection budgie', regurgitate their food, believing they are feeding it and quickly become malnourished.
Depending on where you live, as to what natural perches are of a safe wood...budgies love nothing more than to chew on their perches.
If both are females, be careful not to introduce a male to the mix, severe squabling may insue...
Great that you are researching budgerigars - but, there is a lot of misinformation on some sites.
Both are lovely budgies - hope you get a lot of enjoyment from them.