My gf almost ped out from an easy workout, i found out shes anemic is there anything i should avoid in gym?

we started out w a jog for 8 mins she ran @ 6 on the treadmill, and then did 2 sets of moderate upper body machine work (chest, back, bi;s, tri's) only.....was it the run or the machines that made her like that? she said she saw stars and black spots the whole 9.....anything will hel! thx!