At the end of Star Trek: Discovery 2x11 ("Perpetual Infinity"), it becomes clear that
Gabrielle Burnham herself, not just her "red angel" suit,
is somehow linked to the time she operates from. (Why that should be the case entirely escapes me, but this is not the topic of this question.)
As a consequence, it is expected that
she will be pulled back to said time of origin along with her suit as soon as the forcefield is lowered.
Before this happens, there is ample time for her to get into the suit again
(as we saw her do rather quickly and spontaneously earlier in the same episode, in a flashback to the Klingon attack)
yet she doesn't, and
the suit and her are sucked into the time vortex separately.
Why in the world wouldn't she put on the suit?
Even if she doesn't end up in open space (as she did after her jump right after the Klingon attack), the time vortex appears to violently pull her in and there is nothing to suggest she would arrive any more smoothly on the other side. The suit's apparent capability to hover over the ground could save her life upon arrival.