Need some advice on family friend

Kyara

So my in-laws have a family friend who is 32. This family friend was going to be related to us by marrying my mother-in-law‘s nephew. My mother-in-law‘s nephew and his 32-year-old female broke up almost 2 years ago this female friend has been texting me nonstop daily saying how much she misses the nephew but then she goes and talks crap about him on Facebook and she’s been doing this for almost 2 years everybody that I know it’s super annoying with her basically doing this. What I need help with is do I tell her that people are kind of getting annoyed with her going back-and-forth or do I just leave it be?