The assistant manager told me in August of 2018 that they already knew she wasn't, even though Rani was off exhibit getting a sonogram at the time. There have been quite a few breedings, and staff will tell you what's up in person, but I think it will be a long time into a possible pregnancy before anything is announced. The team waited until a very long, near-death illness of Bozie miraculously resolved before revealing it at all. The panda, great cat and pinniped teams are known for providing very regular and informative updates about their lives in general. The elephant team has gotten a bit better with isolated reports on advances in Shanthi's arthritis treatments, and intro of Spike, and one on training Swarna to accept a radiograph plate next to her head for dental x-rays, but there's no regular update and never any breeding reports that I can recall. Back before the Calgary girls (Kandula's family) arrived, the zoo had been offered female calfs from Ringling--a big deal to DC because it would have meant homeboy Kandula could stay. However, the zoo and Smithsonian were nervous about accepting "controversial" Ringling elephants and all the activists that would rain down on DC, fairly perhaps feeling that a national zoo should represent everyone's interests and not show partiality. This is essentially their communication policy to this day--talk about nothing that could be controversial. Births and deaths are all reported in the Newsroom link way at the bottom of the page; from there, you can go back further than what's offered by hitting the Press Archive button.