Can dependent of Tier2 ICT work in UK without primary applicant?

[Suma123]

Hi All,
Queries on behalf of my friend. He is sponsored Tier2 ICT visa by the employer and wife has a dependent visa (2 years validity) with the below situation:
1. Wife is working on a defendant visa (2 year’s validity), if her husband is returning India in a year, would the wife be able to continue her job for rest one year ?
2. When we are working on a dependent visa, if we get a work permit, do we need cooling off period to get a work permit to work there .

thanks,
Sabana