Hi there...
I was going to suggest teething, as 1st year molars come through at around 15 mths.
Is she just difficult to settle at BT or for naps as well?
Although your routine looks ok, I do think you could push her nap back a bit later (12pm-ish) & then also do a slightly later BT (7pm-ish).
When she wakes at night, what does she do? Is she crying? Babbling? etc