Dude... your misses sure can sing. Bravo!
OK being a Brit it's my odious displeasure to play the Simon Cowl bit. yep she has talent. The looks and stage presents can be worked on (working off poor vid and first impression). However, there has to be hundreds or so, equally talented country singers working the circuit.
Can she or the band write their own stuff? (not a country fan so don't know if that was original). Can a tour be organised or a few competitions entered?
As is, I would imagine she has every potential to fulfil a live music country circuit. Stardom and riches is a different ball game involving hard work, fan base building, demo tapes and lots of luck.
No harm in sending out demo tapes in the US or even Europe. Its been known for a few Americans to get famous over this side of the pond before their recognised at home.
Good luck best wishes
Steve
Lynx