"I don't know either but as I said, I was playing v26.06, not v26.06.1d, so I didn't have the latest bugfixes"That explains why you didn't understand what I'm saying. It's not that I couldn't advance in Lavish route, she just didn't appear at all. After the party where Aletta introduces her to you and working the day after, the event of her starting to work with you simply did not happen. Then again, everything works fine now so let's just drop the subject.
Because I am playing the 23.6.0a version, Lavish does not have the problem of not working after the party. Unless you are using an earlier version than 23.6.0a and have this bug.