Hi,
I'm currently on Tier 2 General visa and my spouse is on my Dependant visa. However, her employer now wishes to sponsor her visa. We have the following queries in this regard -

Could she switch from 'Tier 2 General Dependant' to 'Tier 2 General' from inside the UK?

Would a Cooling-Off period apply to her?

The most important of all, would her current visa (Tier 2 General Dependant) get Invalid as soon as she submits the application for Tier 2 General visa, irrespective of the outcome?
Could the Moderators/Experts please shed some light on these queries?
Many Thanks.