SuperSaiyan
Hi, and welcome to the Forum from Canada.
Now regarding the diet of your Java Finch...
Is she an only bird, or are there others with her?
What exactly are you feeding you'r Java(s)?
You mention boiled rice.
Although Javas, are known as Java Rice Sparrows, rice is definitely not enough for them, nor is it healthy to feed that alone.
***Java Finches, need a good quality seed diet.
A mixture of Budgie Parakeet and a Finch/Canary seed mixture is required. Seeds like White Proso Millet, Canary Seed, and Oat Grouts, are important. Soray Millet, is loved by most birds.
****Hard boiled eggs, are extremely important as a source of protein, and Vitamine D3, and should be offered 2 or 3 times a week.
*** Save the egg shells, dry them, crush them, and offer to your birds. Egg shells, are a wonderful source of Calcium for birds, most especially egg laying females.
You can also get cuttle bone, and oyster shell grit for your birds to offer them extra Calcium.
***The Vitamine D in the eggs, will help your birds absorbe the Calcium, so that they can use it in their bodies. Some unfiltered sunlight daily, will also offer Vit D3, but don't allow your birds to become too hot (so offer some shade as well).
***Green, like spinach, romain lettuce, beet greens, kale, broccoli, parsley, etc. are very important in the Java diet, as are fruits, like apples, oranges, banana, grapes, melons, pears, etc.
Let us know how your birds are doing, and good luck.