Weird lady at church

There's this weird lady at my momma's church that has been extremely weird about my oldest child. My oldest just turned 17. He is friends with this ladies son and only sees her when he's spending the night at my momma's because she takes them to church on Sunday. He told me this lady asked him was it true that he's still a virgin because she heard it from her son. Which he found really weird because it is. That's weird and gross. I confronted her and she said she wants my son and her daughter to get together because boys there age just only want one thing and aren't living correctly and she has her daughter wearing a puberty ring so she stays pure for marriage and only marry a pure man. Since my son is pure she thinks we should marry them when they are both 18. I told her that's weird. I'm not marrying my kid. If he wants to date her it's whatever but I'm not arranging an engagement for him. My son doesn't want to even go to church with my momma because this lady has this obsession with him being a virgin and keeps trying to talk to him about it and talk him into marrying this ladies daughter that he's not interested in. I know all my children. My son isn't a virgin because he's saving himself. He's a virgin because he chooses not to date in general. She's preaching a lot of toxic purity nonsense to him and I told my momma to talk to her because shes weird but I guess my momma has spoken to her and likes the idea of marrying them. I told her if she won't tell her friend to stop being weird they won't go to church with her anymore and it's become this whole thing and idek how we got here because things were normal weeks ago. I'm not sure how I'm supposed to handle this