My mom watched my kids in 2015. I paid her $1500. I do not need to take out SS or medicare as there is exemption for that with family. Does she need to file?

My mom's only income this year besides this was social security.According to what I read, she does not have to file a tax return if her income is under $11,300 I believe. (and SS income is not seen as income for these purposes).  Does she need to file because I paid her?  I did not take taxes out of her pay.