It sounds like she you have quite ao good routine so I would say it's just a stage! Not very helpful I know but honestly sometimes they just do things for NO GOOD REASON!!!

About 2 weeks ago Mackenzie was waking every night 2-3 times and the only way to comfort her was cuddles in bed where she fell asleep with us but then proceeded to toss and turn (not a great night for us!). This went on for a week and then we just said "enough!". She cried it out for about an hour and that was it - back to normal 12 hour sleeps.

We thought maybe teeth but no, we though unwell but no. My grilfriend told me that sometimes when kids are going through a change .ie learning to walk or a new skill of some sort then they are out of sorts for the week or so before that. No idea if there is any truth in it but hey! I'll go with it!