Do non-residents have to pay fica tax

Hi,

My wife is on a L2 visa. She was self employed in 2022. She only earned $4200. She made no fica tax estimates as we didn't know she had to.

Sprintax said she owes a certain amount of federal tax but didn't mention fica tax. When we asked their support they said she didn't have to pay it - I just wanted to confirm that was true?

Thanks,
Chris