If you want your woman to become calm and stop being emotional you need to be smart about how you go about asking. The two things you should never say to a woman are “calm down” and “relax”. If you tell her to do either of those two things you’ll mostly like get the opposite reaction — it will infuriate her. Because it suggests you think she’s being irrational and demeans what she’s trying to express.
Instead, ask for a timeout. Tell her you do not understand what she needs and you’d like to push the pause button to slow things down, also, that you don’t want to argue with her.
If she’s yelling at you and she’s not capable of calming down then tell her, “I’m not going to listen to you while you’re yelling at me.” Then tell her you’re leaving (or hanging up) until she can have a civil conversation with you.
You may also want to watch How to Stop Arguing and read How to Fight Fairly to Help Your Relationship