H4 to H1 to H4 Change of Status (in USA)

Hi Amit,
Asking on behalf of my friend , her H4 visa extension filled during nov2019 is still pending with USCIS , her H1B filled in April 2019 is approved in July 2020(after 15 months)

She did not join the employer on h1b due to health issues , still awaiting for H4 , as per employer words she is still on H4.

She received an email stating “correspondence received and they are reviewing it “

Please suggest me , on the following points , 1) actually H4 to h1 auto conversion happened in her case ? 2) How to know the current status of visa .
3. if she is on h1 , how to get converted to H4 again , due to health she cannot travel immediately .