Sounds like she's going through some development or change (as they do!) Try not to stress too much about how each evening will pan out. It'll settle down eventually. If she needs you, then just be there for her, if she settles on her own, then bonus for you Probably best not to make any plans for your free time just yet.. then you won't stress if you find you need to sit with her.

My DD has just gone down.. but I've no doubt she'll be back up in about an hr or so. hehe. Can't imagine her going down for the night now! LOL. I should really go and fix dinner while she's asleep!