Modern composers often have their own websites with information about their compositions, recordings, articles, press releases, contact information, speeches, photographs, reviews, etc.
Professional recordings of these composers' music can often be found on YouTube.
The Library of Congress has information on women composers. Search their website with the term WOMEN COMPOSERS. You may also try the names of individual composers.
Publisher websites have information about their represented composers and their published works. Some will include brief biographical information. Some examples are below.
Wikipedia is useful for locating brief information about a composer. This can include biographical information, list of compositions, recordings, musical career, awards, and references to other information.