Yes 15 and 85 are respectively the max points.
I saw a post some page or two back that mentioned that and showed the code indicators,,,,, but I had her at one time on one of my many run troughs before the patch (your mod) was fixed, and Julia was at 84 Shy from about day 6 or 7 I think and she changed a second time at night to a slightly different night wear, and when went to bed instead of just being up next to MC he called her over to him. Now stuck at what seems to be max of shy 85 and she gets in bed and goes next to MC to end night. Dont remember the bookmark count had to stop for a while to let my eyes uncross...
I think her horny points go up each day if you take shower and play her I am at 18 or 19