If the $2,832 is the only income she has received and is all earned income reported on the W-2 then she does not have to file a tax return. If she does not file then the US government gets to keep the federal income taxes that were withheld from her wages, free money for them. The Social Security taxes that were withheld from her wages will be credited to her Social Security account, regardless if she files a tax return or not.
If she does file a tax return to get a refund of the federal taxes withheld, make double sure that on her tax return she indicates that she can be claimed as a dependent.
