The internet is abuzz with speculation over the identity and occupation of the woman in the blue dress seen escorting Hillary Clinton from the 9/11 memorial on Sunday before she collapsed.

Is she a nurse, perhaps?

'Undercover nurse' appears to check Hillary Clinton's pulse before 9/11 memorial collapse https://t.co/3G0JUHytD3 pic.twitter.com/0W4mDX25JH — Daily Mail US (@DailyMail) September 13, 2016

Blue sunglasses to correct double vision? Hand on chest to stop tremor? RT "Do pictures show Hillary's nurse?" https://t.co/ALHLWOnCoX — Monica Crowley (@MonicaCrowley) September 13, 2016

Hillary Clinton's 'undercover nurse' sparks wild conspiracy theories https://t.co/AlIL18UPbM via @telegraphnews — Bo Snerdley (@BoSnerdley) September 13, 2016

There’s also some speculation that woman is actually Hillary’s doctor, Dr. Lisa Bardack:

Question: was the woman in the dark blue dress with Hillary today her doctor, Dr. Lisa Bardack? Do candidates usually have docs with them? — (((LifebytheCreek))) (@lifebythecreek) September 12, 2016

Another photo shows the mystery woman apparently performing a “squeeze my fingers” test on the Democratic candidate:

The Daily Mail reached out to the Clinton campaign and Dr. Bardack for comment on the mystery woman’s identity, but has yet to hear back:

The woman in question was identified by some as Dr Bardack, but she could not be contacted for comment. […] Hillary Clinton’s camp have been contacted for comment.

So, who is she?

***