No. It is maxed at 70%. can't increase it. What is the set-up to talk to her, that I missed?
Viewing post in Love & Sex : Second Base comments
When she asked if she could date other people, you have to say no for her sub stat to reach 100. Otherwise it's locked at 70. Looking at the Wiki though, you might just need her to be fired from her previous job 3 times.
https://wiki.andrealphusgames.com/wiki/Palla#Palla%E2%80%99s_Career