R.H.
Hi K. -
I have a 28 month old little boy that did the same thing at one year, again at 18 months, at 22 months and just did it again last week.
He normally sleeps great and I was surprised the first time that he did this. But, it seems to be a phase that he goes through. I'm not sure if it is happening at the same time as a growth spurt, or a teething time, or what!
As long as you stick to your routine, your daughter will probably return to her habit of nicely going to bed on her own.
I've found that I can shorten the length of these phases by taking my son out of the house in the evening and completely wearing him out one night. Last week we went to Chuck E Cheese's (we have a 5 year old that picked the "fun place" to go that night). We ran around and played until about a 1/2 hour before bed. Then, we came home, had a quick bath and he was too sleepy to argue about going to bed. In fact, he seemed happy to be laying his head down on his pillow and snuggling up with his blanket.
Good luck!
--R.