Actually there is a second skip. Way back at her getting out of the car. Most likely had assistance getting out and looks like there was an edit there too.
I thought about looking more intently at the part where she is getting out of the van, but I was so much more interested to see if anyone else had noticed that peculiar skip at that what is convenient for Hillary, moment.
I just thought it was odd that the video would skip just before she put her foot on the staircase.