She is in hiding after taking revenge on the pair of drunken Imperial soldiers who killed her parents. Angi is skilled with her bow and is willing to train archery for free by taking part in practice sessions in her camp. Completion of the training will grant the Dragonborn her bow, a slightly improved, non-enchanted hunting bow that belonged to her family.
When training with her, she will talk about her family, each stage reveals more about her and how her family trained her to use a bow.
Her mother was the one that trained her with the bow, because her father was always gone. Her mother taught her that the secret was speed and composure. She also taught her that keeping calm, even in the midst of chaos, your arrow would always find its target.
When she was younger, her older brother would take her out hunting. At the time, food was hard to come by, making it difficult to put food on the table, let alone sell at market. Whenever the two of them came across multiple deer in a single area it was important to kill as many as possible. This helped her not only become accurate, but quick.
Unmarked quest to train archery.
- You may notice that Angi's arrows don't always hit the targets, yet the visual effect of a hit still shows (Most noticeable when she's firing at the back target). This is because Angi is scripted to always hit the targets.
- Judging by dialogue options with Angi, it is possible she was originally intented to be a target of the Dark Brotherhood, or another similar quest.