Hi L.!
Yes, it's usually the age where all the screaming begins. There are MANY things that a mom should be prepared for during this "stage" :o) Patience is a must, picking your battles, and consistency is a very key part.
Truly though, it sounds like you have been blessed with a perfect little sleeper for the first 21 months :o) She's just now more aware of what she's able to do.....get you to soothe her. And really....what's so wrong with that :o)
She may just be ready for a new bed routine. Something with books and snuggles, then sleep.
I'll be honest.....I took the "easy way out" at this age :o) I did errands every morning around 10am. By the time we were headed home, it was between 12-12:30 and my son would usually fall asleep for a short nap, and I would carry him in and put him to bed :o) We rocked together for a bedtime routine, so that's another story :o)
But, honestly, it wasn't too long after this (before 3) that he was ready for "no naps". We would lay down and rest (together), and he would only fall asleep every 3 days or so. This was his routine all the way through Kindergarten!
Anyway, all kids are different. It sounds like your daughter simply needs her mommy, and needs a slight adjustment in a sleeping routine that comforts her :o)
I'm sure you know exactly what to do :o)
:o) N.