How did Anna Komnene research for the “Alexiad”?

r/

She was banished to a monastery after failing to usurp her brother, so how did she actually do all the research necessary to write an in-depth account of what was, from her point of view, current events/fairly recent history?

I know she was basically a genius and had the best education possible for the time, but wouldn’t she have needed to travel to look through local records, maybe interview witnesses, or whatever else people do when researching for such a book? Like how Mike Duncan studied French and moved to Paris while writing his book on the Marquis de Lafayette?

Apologies if this is a dumb question with an obvious answer, but I couldn’t find anything online.

Sources(in English) would be appreciated as well.