What should be W-4 status for NRA spouse who files resident joint return?

I am a US resident and my spouse is a non-resident alien on an F-1 visa. Last year, we filed our taxes jointly by making a choice to treat her as a resident alien.

My understanding is that in this given situation my NRA spouse isn't required to pay social security and Medicare taxes. Is this correct?

If so, could she identify her as NRA on W-4 form? If not, how to avoid paying social security and Medicare taxes on her income?

Also, how should she file the W-4 form in this situation?