One habit per video, about a minute each. Watch once, then do it along with her, out loud. When you are done, try a scored drill and hear the difference in your own voice.
A cold voice sounds tight and nervous. Give it sixty seconds before any test or interview. Do it with her.
A thin, pushed voice comes from the throat. A calm, full voice comes from the chest. Here is the drill.
Rushing makes you sound nervous. Pausing makes you sound sure.
In English, the word you stress changes the meaning. Say each one out loud.
Thin or tin. Vest or west. How to make each sound, with minimal pairs.
If your voice goes up at the end, a statement sounds like a question. Here is how to sound sure.
Say aah. If it squeezes in your throat, your voice is starting in the wrong place.
Hand on your chest. Hums, mmms, ngs, then open aahs. Feel the buzz move down for a fuller, warmer voice.