Monday05:00–07:00 and 11:00–12:00
Tuesday03:00–05:00 and 09:00–11:00 and 17:00–21:00
Wednesday03:00–04:00 and 11:00–12:00 and 19:00–21:00
Thursday03:00–04:00 and 05:00–09:00 and 15:00–17:00 and 18:00–23:00
Friday04:00–05:00 and 08:00–09:00 and 14:00–18:00 and 20:00–23:00
Saturday13:00–16:00 and 18:00–21:00
Sunday04:00–06:00 and 15:00–16:00 and 17:00–19:00 and 20:00–22:00
There is no day of the week where she is simply absent. When the room opens it tends to stay open: about 2 hours at a stretch. Anywhere else on the grid and you are mostly guessing.