That's probably your problem right there.and i never meet her at night.
You need to have catch her in the living room at night a few times watching TV.
Your only hope is to use the cheat mod and set her relationship points to about 15 and try to catch her in the living room at night.
If she's not there when you go to the living room, you need to wait an hour to see if she shows up.
Rewind time using the cheat mod and wait again if necessary, if she don't show up after 6-7 waits. Try again the next night.
Same thing with the swimming pool scene, she is there around 01:00 - 03:00 time frame. Keep rewinding time and wait until your patience gives out and try again another night.