SS taxes

My wife has been collecting SS for 3 years.  She's 68. She has a job where she earned $33,280 in 2024.  Box 4 (SS Tax) of her W2 shows $2,063.36 withheld and Box 6 (Medicare tax) shows $482.56 withheld. Why is this happening and where does this money go? Will she receive more SS benefits? Will it be somehow credited to her income tax withholding? We file jointly.