Hillary Clinton Diagnosed With Pneumonia: Tick-Tock of the Candidate's Day She was seen on video being assisted into a campaign van.

 -- Hillary Clinton's personal doctor revealed on Sunday that the Democratic candidate was diagnosed with pneumonia on Friday, hours after Clinton drew attention for abruptly leaving a 9/11 memorial event at Ground Zero and was seen on video apparently being assisted getting into a van.

The video, taken by an audience member at the ceremony, shows the Democratic presidential nominee -- who has recently brushed off attacks from her opponent Donald Trump about her health -- being assisted by aides as she got into her campaign's van.

Hours after the incident, Clinton's longtime doctor, Dr. Lisa Bardack, released a statement revealing that the former secretary of state was diagnosed with pneumonia on Friday following a "prolonged cough," and was given antibiotics. The doctor, who examined Clinton this afternoon at her home in Chappaqua, N.Y., said Clinton "became overheated and dehydrated" during the ceremony this morning, and that "she is now re-hydrated and recovering nicely."

Here is a tick-tock of how the events unfolded today:

8:20 a.m. Clinton, wearing a dark navy suit and dark circular sunglasses, arrives at Ground Zero for the ceremony to mark the 15th anniversary of September 11. She greets attendees and takes her spot in the audience next to New York Senators Chuck Schumer and Kristan Gillibrand.

9:23 a.m. Clinton, surrounded by aides, leaves where she is standing at the ceremony. (She likely departed the site around this time, however the exact time is not known since the small, rotating pool of journalists typically designated to follow the candidate closely was not allowed to stick with her during the event.)

11:03 a.m. Clinton campaign spokesman Nick Merrill releases a statement explaining that Clinton "felt overheated" during the ceremony, that she left to go to her daughter's Manhattan apartment and that she is now feeling "much better."

11:47 a.m. Clinton departs Chelsea Clinton's apartment in the Flatiron area on Manhattan. When asked what happened, she tells reporters, "I'm feeling great. It's a beautiful day in New York." She then hugs a little girl that runs up to her on the street before getting in her "Scooby" van and driving away. (Per a spokeswoman for Chelsea Clinton, the former First Daughter was home when her mother arrived. Clinton played with her grandchildren before departing.)

1:13 p.m. Clinton's motorcade arrives back at her home in Chappaqua, N.Y. The campaign did not say whether Clinton made any stops along the way.

5:16 p.m. Clinton's longtime doctor, Dr. Lisa Bardack releases a statement saying Clinton was diagnosed with pneumonia on Friday following an examination due to her "prolonged cough," which the campaign attributed to allergies last week. The doctor -- who an aide says examined Clinton this afternoon at her home in Chappaqua -- says that Clinton was put on antibiotics, and advised to rest and modify her schedule. On today's incident, she says Clinton "became overheated and dehydrated" and that "she is now re-hydrated and recovering nicely."

5:58 p.m. A senior aide to Clinton tells the press pool that Clinton's trip to California on Monday for fundraisers is very much in question as the campaign discusses whether to travel tomorrow or not.

Clinton is expected to spend the rest of her Sunday at home in Chappaqua, N.Y.