Never talk with here unless she pings you (in case she wants to move out) Hit her with nets. This will make the friendship level drop off a cliff so she wants to move out
From personal experience, I don't think they'll ping you(or at least are less likely to) unless you've talked to them that day or week. I guess you should talk to them once a day, and if they ask you to do a task, say yes but never do it, or, if you can, ruin it. For example, say that you'll deliver a letter, but open it instead. I've never really had a villager I hated in CF, so I'm not sure what you should do exactly or if what I said works/is true. Good luck!