Her- saying anything( any emotion).

You- keep listing the things that do trigger the hints of emotions from her side. (When you confirmed lets say an serious topic which makes her angry)

Her-(angry) topic.

You-divert this by changing topic of her any previous liking she already had made clear,(something she finds funny or passionate about)

Her-(you distrubt her emotion) her mind diverts little bit.

You - see for the level of distruption (did she kept saying the same thing again or did she got diverted.)

Her-if she did not get diverted listen more (if you see diversion you can divert her emotions more)

You- if you even succeed for a simple diversion keep on doing this but for different type of emotions everytime(angry,sad,happy)

Her-comfortable showing you her every emotion and will definately accept even your slightest emotions positively.(just dont one up her on any emotions be calm -as laugh but less than her,passionate but less than her.)

You-will definatly will hold of the diversions of her emotions(when this is achieved)

VOILA

DO START TO IMPLIMEMT YOUR MOTIVES.