We hear them frantically say '4 life signs' and Shaw says something like 'get them all we're pretty much a hotel at this point' and then we see the 3 beamed back and they don't seem concerned that Beverly isn't there. I guess they assumed she was sent to sickbay. Perhaps there is something built into the transport that picks up cryo-pods and beams them straight to sickbay. It felt strange to me at that moment..I mean, straight to sickbay has been a part of Trek since at least TNG, if my memory serves correctly.
Of course, it would be a little strange to see the 3 men and a giant cryostasis chamber to the transporter.