estar because if she feels sad then she is being depressed and if she is on another place the she is being there
estar=being
un libro nuevo<span>a new book (masculine singular)dos libros nuev</span>ostwo new books (masculine plural) una mesa nueva<span>a new table (feminine singular)dos mesas nuev</span>as<span>two new tables (feminine plural)</span>
A pair of word that seem to be cognates
The second choice Ronca es gorda because the dog is female so it would be feminine.
