I've just played every girl to completion on the 2.1.6c patch (had to wait for 2.1.6d for Ayesha) but that's the only woman I had problems with. Never had this issue with Lavish, or any other really.
Is this when you're her sub? Never done that but I imagine that it works similarly to the route where she's your pet. On that route you'll have to progress with Dwayne & Cassidy far enough, and get her stats high enough and then she'll stay after dates willingly.
Again, you're simply not progressing with them enough before you try to date and have sex with them.
Palla dating unlocks after an event (she takes you to the restaurant)
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Not a Patreon anymore but I believe most content is voted on. Which is why Bree never gets any.
The game will remain buggy due to the devs coding practices, not really a lot to be done about it from our (players) side.