There is a pecking order in chicken society. She is likely trying to establish dominance instead of being scared of other chickens.
I recommend a less productive breed like a Cornish, Brahma or D'Uccle.
Outright, she is going to lay an egg starting at about 6 months unless you virtually starve her.
So here's what I suggest. Build her a coop. I don't care if it's in your bedroom or your backyard; just build her a coop so she has a secure place to sleep at night. It will also make her far happier because she will feel like she has an area to retreat to for privacy and safety.
If you are willing, get her an OLDER friend. It will increase her mental and physical health having another chicken around because as hard as all of us animal lovers try, we cannot replicate everything about another species. It is just not possible. There are studies out there to prove that chickens create best friends and that same-species companionship can lengthen a chicken's lifespan.

There will be a few spats, but then things will settle.
Second, keeping her exclusively indoors is actually bad for her overall health. There is a bacteria called Coccidiosis that can seriously harm or kill a chicken when the population of bacteria grows to large. One way that this can happen is when a chicken kept inside its whole life is introduced to the outdoors. It kills very quick. I had this happen to my chicks that lived in the house for the first two months of their lives and were treated like human babies.

To combat this I recommend bringing in clods of dirt and grass from your yard every week.
For a non commercial diet I recommend a diet of 60% wheat, 20% Soy Protein, 10% barley, oats and various other cereal grains and 10% veggies % fruits. (I am aware that more specific diets exist but this is pretty general for nutrition and maintenance).
I have heard that some good free choice mineral supplements for chickens are kelp, dried parsley, dried marigold petals, oyster shell, and grit for digestion. A little Diatomaceous Earth mixed into her feed will help boost her metabolism as well
If you have any more questions about feeding a non commercial diet feel free to ask me. I didn't feed commercial for 3 months straight and my hens were THRIVING.