Over tired 16 month old

[lottieleo]

My dd (16month) is currently in this vicious circle of being over tired. She's having little day time sleep, waking for long periods in the night, or really early wake ups. She's often grumpier after her day time nap that before it.
I have kept to her normal routine but doesn't seem to be levelling it's self out.
Any tips?

Has she just dropped to one nap? I wonder if she’s going through a transition in her daytime sleep which is affecting her overall.

No she's been down to one since around 12 months.
She's never been a very good sleeper most of her day time naps only last 45 mins.