Cardio
She is running so it couldn’t be the other ones
Place it on the side of your windpipe, and wen u count ,.. count the number of beats in 15 seconds..like feel the bone of ur jaw line.. and push in. the when u feel a beat there u go.. sometimes u may have to hold your breath to focus on the beat
Know that u will see them again after death.
Find someone to talk to about it/