Hi Honey,
As your DD is 19mo I have moved you to Sleeping for Toddlers board as this is the best place to discuss sleeping problems for 1yo+.
Hope you will find some help here!
My general comments would be:
- is she napping for 1.5h for long? Maybe it's time to cap her nap slightly?
- at 18mo there is an awful sleep regression which usually has to be just rode out... how long your NW are going on?
I also encourage you to see this thread where mummies with kiddos around 18mo talk about sleep regression.
18 month sleep regression support thread-part 3