<human>: My friend, Donna, who is well aware that I'm not friendly with a neighbor lady has invited this woman and her family to her (Donna) kid's bday party.

This neighbor person has been trying to befriend Donna for a long time and pretty much stalking her by being outside when Donna is out, walking by her house when Donna is supposed to come home from work, chatting her up at every opportunity, etc.  I could tell Donna was welcoming this wooing.  I think she liked the attention and kiss-up.  They also became Facebook friends.

This is the first time Donna has invited this neighbor person to her home and to her kid's bday party.

I'm not sure how to handle this situation.  I feel betrayed, but mostly afraid that this neighbor is going to 'steal' her from me.  I work full time and have kids; I can't be at Donna's beck and call like this stalker.  Donna and my kids play and our two families are good friends of several years, so not so easy to just 'forget' her or ignore this matter.

I've tried to ignore but it's not working, I've also tried many times to be cordial with the neighbor woman, but it's not mutual.  She's nasty, a gossip and opportunist.

Do I say something to my friend of my disappointment and concern that the neighbor will take her away from our friendship (it sounds so childish, but I feel it's true) or do nothing or any advise please?  Thanks.

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<bot>: Should I say something to my friend for inviting this rotten woman and her family to the bday and me feeling betrayed and the stalker is going to steal her from me?