Hi there,
There's a lot of information here. I think you've identified one of the problems yourself, you are being inconsistent; that coupled with the fact that dd is chaning her sleep habits.
Gracie was about 14 months when her sllep habits started to change and she went from two naps to one. It probably took 4-5 weeks before it settled out. She has always been a good sleeper till that point. She also had some family issues, the loss of my mum and the arrival of her baby borther complicated everything.
Can I ask that your daily routing is? For example, for Gracie at 15 months (after the sleep problem had resovled) it was something like this:
Wake at 7.15am
Cuddles and play till 8am
Breakfast 8-8.30am
Play 8.30 - 10.30am
Snack
PLay till 12ish
Lunchtime 12-1.00pm
Sleep 1.00-3.00pm
Play 3.00-4.30pm
Dinner 4.30-5.00pm
Play 5.00-5.45pm
Bath
Bed by 6.30pm
The routine was very much driven by Gracie. Some days if she'd had a very busy morning, she would sleep a bit earlier but I've rarely let her sleep longer than 2 hours.
I think as a parent you read all the books and particularly when its your first baby, (I had no idea)! it can be difficult. I'd thnk about how you can add some structure to your day but take little steps to acomplish them. It may take a couple of weeks. I have to say, just as you think you've cracked the problem, you get a few weeks of calm and then they do something else that's new and you don't quite know what to do about it!! All I can say, it's easier second time around.
Hope this helps a bit. Good luck and let us know if you have anymore questions
Lavinia
Happy Holidays x