CW’s questions ARE out of line. OP continued to engage in discussion about the topic, which was a mistake. People like this CW need to be cut off quickly and firmly.
Other than hello, goodbye, thanks, excuse me, and mandatory interaction I would not interact with this CW. Forget about her being “nice”. Boundaries? That's just a buzzword. Her background is here nor there. She's nosey, she has hidden agendas, and she is t-r-o-u-b-l-e.
OP will only have more stories IF she allows this CW to pull her into her web, so to speak. Watch your step, OP.