That makes sense because when you plot reset the villager is still there since it's 6am so Molly is still there so that maby means that Molly crossed out Wendy? You should add all the stuff you just told me to your thread. I think that may be the problem
This happened to me once with a villager and they never showed up, That's why when I get a villager I talk to them like 8 times and have the person check the door to make sure it says "Moved Out"