Is that the plan, tho? Nothing really pointed to it except some light flirting form an overly-hormonal teenager...
I say it's all BS. This is just a normal slice of life manga disguising itself as suspense-drama.
Burning of old items from old marks, flash back of mom with someone much older when she was a child, mom saying she has someone she loves implied not husband or kid, and Touko celebrating the start of her periods.
I mean it's good if she's good at hacking but other than framing the past "papa" for a crime and getting locked up it's not like there's any real danger from anyone but the main women in this series lol
tbf she was never rly a "friend" altho if anything I would've expected her to manipulate the stalker into going after Touko but he's prolly busy mind breaking her in his room