Hey Jhonca!
You may need to progress her or other characters stories a bit, as there may be some overlapping triggers. What quests do you currently have in your quest log?
This is a common progression issue! Usually when you're stuck at max lasciviousness without leveling up, it means there's a specific story event you need to trigger first. Check if you have any incomplete quests for Lyriel in your quest log - sometimes you need to complete certain scenes or conversations before the stat can level up. Also, make sure you're checking the house at different times of day as some progression events are time-specific.