My wife is around the alto range with her voice. Should she do the practices on the lower voices with the male coaches or still do the female lead practices? I just noticed the female lead practices were in the “high voice” category and she isn’t a soprano. Your input is appreciated. Thanks!

Hello! "High voices" here usually refers to all typically female voices (alto, mezzo, soprano). I'm also an alto and most of the female-led lessons on the site are with me! Please see below for a little guidance on exercises going too high or low. 

You can always drop out if an exercise gets too high or low to be sung comfortably. But before dropping out, try three things:

1. Modify the exercise to make it easier (ie: sing on a lip trill, hum or NN/NG instead of an open vowel or other syllable, if that's more doable). 

2. Sing most of the exercise, and just "think" (audiate, or sing in your head) the pitches you can't reach without straining or going sharp/flat. This gives your vocal folds an opportunity to still adjust and prepare to sing those out-of-reach pitches, even if just air comes out. 

3. Make sure you're shifting registers when necessary. For example, you may be unable to sing higher pitches because you're still in chest voice, in which case you'd need to "shift gears" and find your head voice placement.