H1B and H4 both got approved. Which is valid?

Hi,
My wife was on h4 and had filed for H4 extension in September of 2020. Later her employer filed H1B which got approved in January, 2021. So in January we filed for the H4 withdrawal. But instead of withdrawal we got a H4 approval notice on February 19, 2021. Please let me know what is her status now. Is it H4 or H1B?

Thanks,
Ashok