Honey can you remember what changed in her routine when the NWs started? Like you moved her BT later, her WU changed, she started nursery, you stopped any feeds etc?
She can be UT with two 1,5h naps but your day is 13h long so I wouldn't say something is wrong here. You had a nice 2,5h day sleep yesterday and she woke after BT and that usually indicates OT and that would be my first very rough diagnosis.
In general was she a good sleeper before? How many h/24h was she sleeping and how it was divided between day & night?
Have you suffered from 4mo sleep regression? There is another one at 8-10mo so maybe that's what hits you. I don't think it's teething as it's going for a long time already.