Huzzah! I'm glad it worked :3
Sorry for taking so long to respond. OK. Let's figure this out.
I'm assuming you mean that she never calls you to meet you in the forest on Sunday: Midnight.
To start, I recommend to have Jenny set to C2: Prey and Hailey set C2 or higher.
As the corruption guide says, you need to do three of the four options listed. My advice for that is when Lina messages you and asks you to choose someone, it's best to choose Jenny first since it's the most immediate event. Saturday: Morning. Try going to the bathroom when Lina and Jenny are in there, and Lina will hold Jenny so you can...well...do stuff. This is a "winggirl" event.
To trigger a second winggirl event, you need to talk to Jenny and Lina who are by the tree on Saturday:Noon. To get to the winggirl options you select "Barter with Lina" >> "About that Message". The next event you should do is either Cassidy or Hailey.
If you choose Cassidy, her winggirl event will happen on Sunday: Early Morning. Go do Yoga with her...that's pretty much it.
If you choose Hailey, her winggirl event will happen on Sunday: Noon. Be sure not to accept a date with her if she asks. She has to be "free". Visit Hailey in the forest at this time and hijinks will ensue.
Last is Lin's BJ tutorial. On Sunday: Afternoon, visit Jenny and Lina at the tree, navigate to the winggirl events, and choose Lin. Then, on Sunday: Night go visit Lin and Lina. And then BJ's will happen.
After all that, go visit Lina in the forest on Sunday: Midnight.
This was a long explanation. All these corruption levels are pretty elaborate tbh. Good luck!